Large Shia Muslim populations are mainly found in A. Kuwait, Bahrain, and Oman. B. Iran, Iraq, and Syria. C. Qatar, Yemen, and Kuwait. D. Saudi Arabia, Bahrain, and Iraq.

Some places with big Shiia populations are the folowing:

1) Iran

2) Yemen

3) Iraq

4) Syria (on the coast)

5) very small community in the South of Saudi Arabia

6) Turkey

So the best option from the list is B. Iran, Iraq, and Syria. but other countries also have some small Shiia communities!