The correct option is B Deuteron and alpha particle can undergo complete fusion
m(21H)+m(42He)=2.014102+4.002603=6.016705 u
m(63Li)=6.015123 u
m1+m2>M
(A is wrong)
m(11H)+m(20983Bi)=1.007825+208.980388=209.988213 u
m(21084Po)=209.982876 u
m1+m2>M
(B is wrong)
m(21H)+m(42He)=2.014102+4.002603=6.016705 u
63Li=6.015123 u
(m3+m4)>M′
Correct (C), deutron and alpha particle can go complete fusion.
m(7030Zn)+8432Se=69.925325+81.916709=151.842034 u
15264Gd=151.91980.3 u
m3+m4<M′
(D is wrong)