Rewrite the following sentences using the words in brackets. Do not alter the words given.
If you become a parent, you will understand what true resposibity. (ONLY WHEN)
A.Only when you become a parent will you understand what true responsibility is
B.Only when being a parent will you understand what true responsibility is
C.Only when you become a parent would you understand what true responsibility is
D.Only when becoming a parent will you understand what true responsibility is