Answer :
- Calcium, Strontium and Magnesium
[All of the given options]
Explanation :
Alkaline earth metal consists of the group 2 elements.
The elements that belong to group two are :-
1. Beryllium (Be),
2. Magnesium (Mg),
3. Calcium (Ca),
4. Strontium (Sr),
5. Barium (Ba),
6. Radium (Ra).