California's innovation culture and abundance of engineering talent have created a flurry of start-up companies and, in spite of the high employment rate , has not made possible for it to increase tax revenues and the GDP of the state.
If we exclude the additional information, the core sentence would be --> California's culture and talent have created
a flurry of start-up companies and, (in spite of the high employment rate)
Since there is a conjunction 'and', we need the parts to be parallel.
California's culture and talent:
1. have created a flurry of start-up companies, and
2. have not made possible for it to increase tax revenues and the GDP of the state
(A)
has not made possible for it to increase
S-V agreement error.
(B) have not made
into reality the possibility of increasingToo wordy. Option D is better option
(C) it has not made it possible to increase
Same like A, S-V agreement error.
(D) have not made it possible to increase
Correct
(E) have made it impossible to increase
have not made it possible vs have made it impossible are two different things. Not made it possible means it could happen, but in this case, it is not happening.
Meanwhile, impossible means that it is not possible at all and no chance to make it possible in the future.