The correct option is C |F2| may be smaller than, greater than or equal to |F1|
From Newton's second law
Case (i): Let time taken to accelerates a particle from rest to a velocity v is t1
Case (ii):Let time taken to decelerates the same particle from v to rest is t2
F1,F2 depends upon t1,t2. So, F2 may be smaller than, greater than or equal to F1.