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I was originally leaning towards C as well but the sentence seems to say tha the forms of solar energy will be economically competitive now or in a few years. The "will be" in the sentence tells me that the forms of solar energy are not yet economically competitive.
D works for me because it states that forms of solar energy are either (a) already economically competitive or (b) will be in a few years.
http://blog.davidbbaker.com/wp-content/uploads/2015/11/12249800_10153820891439090_8007573611012789132_n.jpg When you think about an MBA program, usually the last thing you think of is professional collegiate sport. (Yes American’s I’m going...