The evidence from the passage which best supports the idea that Adam will have some kind of consequence if he doesn't meet his deadline is:
D. The cursor blinked and blinked, counting away the seconds and minutes announcing his certain demise into the oblivion of writer's block.
Evidence is anything the proves an idea to be right. Here, the idea is that Adam will suffer consequences in case he is unable to meet a deadline. And the best option to prove that right is letter D.
Option D reveals that time is passing by and, in case Adam does not finish his writing, he will meet with his "demise." In other words, bad consequences await him if he cannot finish his work in time.
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