Read the following article and answer the question by choosing from the options.

I did n't get to bed until 6:30 AM and kept waking up , finally getting out of bed at 10:30 . I drank so much coffee to stay awake last night I ' m still all twitchy . My mind is racing all over and my body struggles to keep up .

What may be the reason I drank so much ?
OPT:
(a). I had to watch tv .;
(b). None of the above choices .;
(c). I had to watch a movie .;
(d). I had to study .;...A:
(d).