以下句子哪个可以用在文章的开头段里?

以下句子哪个可以用在文章的开头段里?

A.Nowadays，it is common to ______. Many people like ______ because ______. Besides， ______.

B.The best way to solve this problem I think is to give young people opportunities to do things independently.

C.There is no immediate solution to the problem of …, but … might be helpful / beneficial.

D.It is, therefore, evident that the task of … requires immediate attention.

正确答案是A