I believe the right correction for the sentence would be "The decrease in members from the clubs are affecting". The first option wouldn't be correct because the word "decreasing" doesn't fit right grammar wise in the sentence. Option two wouldn't make any sense put together with the sentence, it would just sound completely out of place. Option three has the word "were" as in it was affecting the club, not presently affecting the club. And obviously, this sentence needs improvement so option five is out of the question.
Answer:
the mean = 0+0+3+3+4/5 = 2
the median =3
the option is A
1.Her application form was handed to the deputy manager
3.The waiter received the order from the father
4.The case was investigated for two months
5.The letters are sent by the secretary in the morning
6.Political leaders usually get interviewed by journalists
7.Famous people are often told they wear expensive getup
8. A new town hall is being built this year
9. His tooth was pulled out by the dentist
10. The pigeons were fed crumbs by the old lady
The answer to this question is often,home