What example$($s$)$ does Menkiti provide to support the claim that personhood is acquired?

a$.$

He relies on the neuter pronoun $$it$$ as well as the absence of ritualised grief over the death of a child to illustrate the nature of personhood.

b$.$

He relies on the fact under the age of $18$ years individuals are not allowed to drink in order to support the claim that personhood is acquired.

c$.$

He relies on the fact most humans under the age of $18$ years make bad decisions in order to support the claim that personhood is acquired.

d$.$

He relies on the fact the age of majority in most cultures is $18$ years in order to support the claim that personhood is acquired.