C is wrong because of tense problems. There are a lot of details which you can weed out but the backbone of the sentence looks like this:
By the end of the decade, X is projected at Y.
When using "projected", it implies speaking in present terms about something happening in he future. However, this sentence cannot be continued in present terms because the introductory modifier "by the end of the decade" requires us to continue the sentence in a future tense. Let's look at an even simpler example:
By tomorrow, I am done
--> This is wrongly established in present tense. You can see how the sentence is awkward and it is precisely what C is doing.
By tomorrow, I will be done
--> "will" future auxiliary is required to speak of something happening "tomorrow", in the future.
Only E uses a future auxiliary correctly.