What is the effect on both RBE and the / ratio as the LET for the type of radiation increases up to 100 keV/m? A.

What is the effect on both RBE and the α/β ratio as the LET for the type of radiation increases up to 100 keV/μm? 

A. Both remain the same 

B. Both increase 

C. Both decrease 

D. The RBE decreases while the α/β increases 

E. The RBE increases while the α/β decreases