Among the following one is wrong
A. The energy of thermal neutrons is about `25 me V`
B. In a nuclear reaction, when neutrons multiplication factor, `K=1` then the reaction is said to be critical
C. `._(92)U^(235)` undergoes fission by bombardment of high energy neutron
D. On average `2.5` neutrons are emitted per fission of `._(92)U^(235)`
