I can't understand why C is right and B is wrong.
Finite is modifying supply in B and that's what C does
by using "supply of oil is finite" which ofcourse is wordy.
You have to look at the sentences more closely to understand the difference between B and C.
(B) The finite supply of oil has become an economical
The meaning of this sentence is that "the
[finite] supply of oil
" has become a consideration. Here finite is just an adjective of supply.
But in C,
(C) That the supply of oil is finite has become an economical
The consideration is that "the supply of oil IS finite
". The problem they have at hand is that the oil supply is finite
. The "oil supply" is not a consideration in itself.
I narrowed it down to C and E. I still feel C is better unless "economical" changes meaning of the senetence as said by Oksana.
dj, what is the OA ?
I'm crossing the bridge.........