A 70-Kg Researcher Absorbs 4 $10^8$ Neutrons in a Work Day, Each of Energy 1

A 70-kg researcher absorbs 4.5 × $10^8$ neutrons in a work day, each of energy 1.2 MeV. The relative biological effectiveness (RBE) for these neutrons is 10. What is the equivalent dosage of the radiation exposure for this researcher, in millirem?

A) 1.2 mrem
B) 0.39 mrem
C) 0.77 mrem
D) 3.7 mrem
E) 12 mrem