Citizenship is acquired by an alien through

A.

Conferment

B.

Internalization

C.

Registration

D.

Birth

Correct answer is C

Citizenship by registration;The following persons are eligible to become citizens through registration:
A foreign woman who marries a citizen of Nigeria. Person who is of adult age (17), born outside Nigeria, any of whose grandparents is or was a citizen of Nigeria. A foreign child adopted by Nigerian parents.