I often visit my parents, who live in the countryside   whenever ____.

1. A.
   I am convenient
2. B.
   it will be convenient to me
3. C.
   I will be convenient
4. D.
   it is convenient to me

I often visit my parents, who live in the countryside whenever_______.

I often visit my parents, who live in the countryside   whenever ____.

I often visit my parents, who live in the countryside whenever_______.

I often visit my parents, who live in the countryside whenever ____.