A Principal Mechanism for Energy Loss During Nuclear Fusion Is $\Delta$

A principal mechanism for energy loss during nuclear fusion is bremsstrahlung.This loss is associated with

A) x-rays emitted due to electron-ion collisions.
B) radiation losses due to T⁴ losses.
C) conduction losses associated with $\Delta$ T.
D) convection losses associated with $\Delta$ T.
E) neutron collisions with atoms of moderator.