The image of ashes in line 10 conveys the speaker's feelings of? in shakespeare's sonnet 73

Icannot see the passage but i’m guessing off of what the passage would be that c is the only correct answer.

At midnight thomas edison opened the door and continued his work, but to his surprise it was so late that he had to get some rest. but with his mind racing and his mind at sake he continued working. hours and hours went untill he got it. he had invented the worlds first lightbulb!