Correct Answer:
c) I love my country.

Explanation:
The correct sentence is option 'c' as it is punctuated correctly. Let's understand the reason behind it.

1. Punctuation in Declarative Sentences:
Declarative sentences are used to make statements or express opinions. They end with a period (.) to indicate a complete thought. In this case, the sentence "I love my country" is a declarative sentence as it expresses the speaker's love for their country.

2. Punctuation Marks:
Punctuation marks are used to clarify the meaning and structure of a sentence. Here are some common punctuation marks and their uses:
- Period (.) is used at the end of declarative sentences.
- Question mark (?) is used at the end of interrogative sentences to indicate a question.
- Exclamation mark (!) is used to express strong emotions or exclamatory statements.

3. Analysis of the Options:
a) "I love my country?" - This option ends with a question mark, which is not appropriate for the given sentence as it is not a question but a statement of love for the country.
b) "I love my country!" - This option ends with an exclamation mark, which indicates strong emotions or exclamatory statements. While the speaker may feel strongly about their love for the country, the sentence is better suited to end with a period to indicate a complete thought.
c) "I love my country." - This option ends with a period, which is the correct punctuation for a declarative sentence. It indicates a complete thought and properly punctuates the sentence.
d) "I love my country," - This option ends with a comma, which is incorrect punctuation for a declarative sentence. A comma is typically used to separate items in a list or to indicate a pause in a sentence, but it does not properly end a sentence.

Conclusion:
The correct punctuation for the given sentence "I love my country" is a period (.), making option 'c' the correct answer.