Question

my cousin who is only 16 years old had been admitted to Oxford university
(pick out adjective clause)​

Answer 1

Answer:

"who is only 16 years old"

Explanation:

This is the adjective clause.

Here "who is only 16 year old " - this clause has been used in stead of "16 year old" cousin. Cousin is a noun and "who is only 16 year old" - this clause qualifies the noun "cousin". so, it is adjective clause.