Its either B or D. I chose B as my first guess because if you know the part of speech, you could better understand how to use the word
B) The mother does not leave him there long enough to weary.
C) As he grows older he is allowed to wade about at low tide.
B) I used to in the past but not now.
C) You only told me you had seen The Three Idiots last week.
The answer is God the Father
The answer would be A. The rest of the sentence is in past tense, so that would also be.