Discussion

Explanation:

A female always remains in the same tribe, irrespective of whether she is married, unmarried, divorced or widowed.

Maternal grandmother is the mother’s mother. If the female is in tribe B, her mother as well as maternal grandmother will always be in tribe B.

Hence, a female in tribe B cannot have her maternal grandmother in tribe A.

Hence, statement a cannot be true.

Now, consider a lady (X) born in tribe A. When she marries, she remains in tribe A, and her husband enters tribe A from tribe B. Assume that she has a son (Y).
 
Y will also be in tribe A.

When Y marries, Y will move to tribe B. Assume that Y has a daughter (Z). Z will be in tribe B, as it is her mother’s tribe.

Thus, a female in tribe B (i.e. Z) can have her paternal grandmother (i.e. X) born in tribe A.

Hence, statement b is true.

Hence, option (b).

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