In which of the following groups all the three members are of the alkaline earth metals family

In which of the following groups all the three members are of the alka

1.	In which of the following groups all the three members are of the alkaline earth metals family
A.	\[Al,\,Sr,\,Ti\]
B.	\[Li,\,Na,\,K\]
C.	\[Mg,\,Ba,\,Ca\]
D.	\[Rb,\,Cs,\,Fr\]
Answer» D. \[Rb,\,Cs,\,Fr\]