Time management is very much important in IIT JAM. The eduncle test series for IIT JAM Mathematical Statistics helped me a lot in this portion. I am very thankful to the test series I bought from eduncle.
Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Ghost.
Option (b) and option(c) are potential contender for the answer, but i think option (b) is correct, if you do Rotate the path followed by one projectile then you can trace the path of others, option (c) can also work to track down the projectile.