for given angle of projection if time of flight is doubled horizontal range will increase to A FOUR TIMES B thrice C once D TWICE

Answer 1

For a projectile with
initial velocity=vi
projection angle = θ with horizontal

The time of flight
=2visin(θ)

If time is doubled with θ unchanged, vi is doubled.

From
range = vi²sin(2θ)/g

you can figure out the increase of the range when time (and vi) is doubled.

Answer 2

Double