B) -

Explanation:
The given expression "- (:-)" is a combination of characters that represents a facial expression. Let's break it down to understand its meaning.

1. Dash (-):
The dash symbol (-) is used to represent a negative or minus sign in mathematics. However, in this context, it is being used as part of the emoticon.

2. Open Parenthesis (:):
The open parenthesis symbol (:) is commonly used in emoticons to represent the eyes of a face. In this case, it represents the eyes of the facial expression.

3. Colon (-):
The colon symbol (-) is used in emoticons to represent the nose of a face. In this case, it represents the nose of the facial expression.

4. Close Parenthesis ():
The close parenthesis symbol () is commonly used in emoticons to represent the mouth of a face. In this case, it represents the mouth of the facial expression.

Putting it all together, "- (:-)" represents a facial expression with a negative or minus sign, followed by eyes, a nose, and a mouth. The specific interpretation of this expression depends on the context in which it is used and the intention of the person using it.

Overall, the given expression is not a valid mathematical operation or a complete emoticon with a widely recognized meaning. It seems to be a combination of characters with no specific significance.

B) The symbol ":-)" represents a smiley face emoticon.

Explanation:
- The symbol ":-)" is a combination of three characters: a colon (:) followed by a hyphen (-) and a closing parenthesis ()).
- When these characters are arranged in this particular order, they form a representation of a smiling face.
- This symbol is commonly used in written communication, such as text messages, emails, and social media posts, to convey a sense of happiness, joy, or friendliness.

Smiley Face Emoticon:
- The smiley face emoticon, represented by ":-)", is a simple way to express positive emotions or intentions in written form.
- The colon (:) represents the eyes of the face, the hyphen (-) represents the nose, and the closing parenthesis ()) represents the mouth.
- When viewed sideways, the combination of these characters resembles a smiling face, hence the name "smiley face."

Usage and Meaning:
- The smiley face emoticon is often used to indicate humor, happiness, or friendliness in a text-based conversation.
- It can help convey positive emotions and tone that may be difficult to express solely through words.
- For example, if someone tells a joke or a funny story, responding with ":-)" can indicate that you found it amusing.
- Similarly, if you want to show appreciation or gratitude, using the smiley face emoticon can add a sense of warmth and positivity to your message.

Variations:
- The basic smiley face emoticon ":-)" has evolved over time, and there are now many variations and adaptations.
- For example, ":-D" represents a wider smile with an open mouth, while ":)" represents a simpler, more neutral smile.
- Additionally, other symbols and characters can be combined with the basic smiley face to create different expressions and emotions.

Conclusion:
In summary, the symbol ":-)" represents a smiley face emoticon used to convey positive emotions, humor, and friendliness in written communication. It is a widely recognized symbol that adds warmth and positivity to text-based conversations.