Answer:
Option d)
Step-by-step explanation:
As the Kinetic energy of the body ids due to the speed of the body and depends on it, it does not depend on the height of the body.
The kinetic energy is given by:
KE =

where
m = mass of the body
v = kinetic energy of the body
Now, as per the question:
Initial velocity is u
and final velocity, v = 2u
Thus
Initial KE =
(1)
FInal KE =
=
FInal KE = 4
(2)
Thus from eqn (1) and (2):
Final KE = 4(Initial KE)
The Kinetic Energy has changed by a factor of 4