I believe the answer to this question is letter C.
The statement suggests that the usage of wind energy is successful in meeting energy needs and demands that is why many European countries have been using this alternative source. With this success, it can be implied, especially to the readers, that wind energy is indeed beneficial not just for small-scale consumption, but also to extensive and wider usages as well.
A comma should follow a dependent clause when the dependent clause come first in a sentence.
When seperating the two clauses, always use a comma.
Answer:
0.0080459770114
Explanation:
7 ÷ 870 = 0.0080459770114
