In the sentence options you provided, we need to determine which antecedent agrees with the pronoun "her." The pronoun "her" is feminine singular, so it should refer to a feminine singular antecedent.
Let's analyze each option:
A) "Martha is best known for her oatmeal cookies."
- "Martha" is a singular feminine noun, so this option is correct.
B) "The Smith is best known for her oatmeal cookies."
- "The Smith" could refer to a singular female, so this could also be acceptable depending on context, but generally "The Smith" is not a commonly accepted proper noun for a specific person.
C) "Jim is best known for her oatmeal cookies."
- "Jim" is a masculine name, so this option is incorrect.
D) "Avery and Michelle is best known for her oatmeal cookies."
- "Avery and Michelle" is plural, and the pronoun "her" does not agree with it, making this option incorrect.
So, the best choice with appropriate antecedent and pronoun agreement is A) Martha is best known for her oatmeal cookies.