3. Amy is ________ than Jane. a. eldest b. elder c. elder d. eld/old

The correct answer is b. elder.

*Explanation:*
"Elder" is used to describe the age of family members. However, in a general comparative context, "older" is more appropriate. Assuming this is a general comparison, "older" would fit best. But since the provided choices are 'eldest,' 'elder,' 'elder,' and 'eld/old,' the most suitable option given the context is elder.

*Translation:*
Эми старше, чем Джейн.