‘You look worried. What’s the matter?” ‘I don’t know ____.’

‘You look worried. What’s the matter?” ‘I don’t know __.’

A.            Where I did leave my car keys

B.            When my car keys are left

C.            Where I left my car keys

D.            When did I leave my car keys

E.            Where are my car keys

Jawaban nya Adalah :  C