The correct answer is interchange.
A. convert into code
C. follow directions, as of a recipe
D. supply additional value
The correct answer is (B) To interchange; to give and get in return; to give and receive mutually. Also, to cause to move backwards and forwards alternatively.
Reciprocate comes from Latin reciprocare (to move back and forth).
Examples of use:
- She reciprocated with an elaborate gift that had been beautifully wrapped
- He reciprocated with a dinner invitation for the following weekend.