A middleweight black hole weighs in at roughly 500 solar masses, hundreds of times more massive than the lightweight black holes produced by the collapse of individual stars but thousands or even millions of times less in its mass as the heavyweight giants that lurk in the centres of galaxies.

a)thousands or even millions of times less in its mass as
b) it is thousands or even millions of times less massive as
c) thousands or even millions of times less massive than
d) yet it is thousands or even millions of times less massive than
e) yet it is thousands or even millions of times less in its mass than

Ans = c

Would appreciate someone really explaining the rational behind this one.