Answer:

To determine the correct answer, we need to understand the difference between possessive pronouns and possessive adjectives.

Possessive Pronouns:
- Possessive pronouns show ownership and do not require a noun following them.
- They replace the noun and function as the subject or object of a sentence.
- Examples: mine, yours, hers, his, its, ours, theirs.

Possessive Adjectives:
- Possessive adjectives also show ownership but are placed before a noun to modify it.
- They describe the noun and agree in gender and number with it.
- Examples: my, your, her, his, its, our, their.

Now, let's analyze the given sentence:

"He watched each gesture of ____ as if she was a stranger."

In this sentence, we are talking about someone's gestures, so we need a possessive pronoun or adjective to show ownership. The pronoun or adjective must agree with the gender of the person who possesses the gestures.

The correct answer is option 'B': hers.

Explanation:
- The word "gesture" is a noun, and we need a possessive pronoun or adjective to describe it.
- The possessive pronoun "hers" is used to show that the gestures belong to a female person.
- Since the sentence mentions "she," it implies that the person being referred to is a female.
- Therefore, we use the possessive pronoun "hers" to indicate ownership.

Example sentence with the correct answer:
"He watched each gesture of hers as if she was a stranger."

The possessive pronoun "hers" replaces the noun, and it shows that the gestures belong to the female person mentioned in the sentence.

Her