The answer is 'd' ,but the complete indirect object is 'her parents' not just 'parents'
The indirect object always answers the question 'who'.
Carol sent who? The answer is 'her parents' which is the indirect object.
I think the answer is annotated bibliography. <span>An </span>annotated bibliography<span> is a list of citations to books, articles, and documents. Each citation is followed by a brief (usually about 150 words) descriptive and evaluative paragraph, the </span>annotation<span>. The purpose of the </span>annotation<span> is to inform the reader of the relevance, accuracy, and quality of the sources cited.</span>
The answer I would put would be past tense.
