Can A users reach the peak and C users reach tens of thousands?

The subject and predicate of the first half sentence is the evolution of short messages from pure text to multimedia, which is obviously wrong and should be changed to "from pure text to multimedia". I think the collocation of the second half sentence is reasonable.

B is a chaotic logical relationship, but it is a causal relationship before and after, so it should be changed to "but it is also because of this." In addition, East Asia and Southeast Asia also have inclusive relations.

C is ambiguous. I don't know whether one quarter refers to people who take this medicine or half refers to people with mental retardation. In addition, tens of thousands of people take this medicine, and none of them can be added.