18.   How many chemical reactions are possible regarding the formation of carbonic acid and the dissolving of calcite? 

A. 23
B. 10
C. 2
D. 3

I am stuck on this I looked in my text book and it shows the words but not the number answers!

3 answers

I think it might be D.3?
It was 3 I found the answer☺
Discribe the formation of carbonic acid