— Why do you eat so little?

   — I’m _______ a diet to reduce some weight.

   A. in           B. on           C. with          D. under

—Why do you eat so little?

—I’m _______ a diet to reduce some weight.

1. A.
   in
2. B.
   on
3. C.
   with
4. D.
   under

—Why do you eat so little?
—I’m _______ a diet to reduce some weight.