Final answer:
The correct word to complete the sentence is 'A nosotros', which means 'to us' in English.
Step-by-step explanation:
The correct answer is OD. A nosotros. In the sentence, 'nos interesan los libros de Tolstoi', the subject is 'nosotros', which means 'we' in English. The verb 'interesan' agrees with the subject, indicating that the books of Tolstoi are of interest to us. Therefore, the correct word to complete the sentence is 'A nosotros', which means 'to us' in English.
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