There are several different reasons depending on the perspective you look at it.
If you're looking at it from the government perspective, then this was due to the fact that they wanted to get rid of the tradition and have a complete take over of the culture by getting rid of it.
Other explanations are that they wanted to switch an alphabet or genuinely wanted to simplify the actual characters.
Hope this helps!
1 A
2 A
3 A
5 I think that is(A)
6 B
7A
8 I think that is B
9 A
10 D
11 D if I'm not wrong
12 I this is between B, D, or A but for me is (B)
13 B
14 B
15 for me is (B) but it can be A, C
