Generally one or two pages, but it could be three, though it isn't often.
Answer:
Visual aids are items of a visual manner, such as graphs, photographs, video clips etc used in addition to spoken information.
Yes it is. Hope It Helped.
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.
