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I awoke this morning in a room that seems unusually light . At first I thought I 'd fallen asleep with the light on , so unaccustomed I am to this phenomenon . Then , with glorious reality I realised it was the light of day . I sprang up out of bed and looked out the window .

What happened before i got out of bed ?
a. It seemed to be pitch dark .. b. I decided to stay in bed and sleep more .. c. I realized that i had slept the whole day away .. d. My room was lit up very brightly ..
d.