It is reported that the railway _____ now will cut the journey time between the two cities by about 12 hours

1. A.
   built
2. B.
   to be built
3. C.
   having built
4. D.
   being built

It is reported that the railway _____ now will cut the journey time between the two cities by about 12 hours.

A. built                        B. to be built                C. having built          D. being built