---How far is it to the airport? 20 kilometers?

---No, it's ______. About 30 kilometers.

1. A.
   far
2. B.
   farther
3. C.
   the farther
4. D.
   the farthest

—How far is it to the airport? 20 kilometers?

—No, it’s ______. About 30 kilometers.

A. far                   B. farther               C. the farther               D. the farthest