Etc . I ' m not a tidy person by nature , so it gets all the more frustrating for me when I realize how much time I devote to keeping everything somewhat clean . I focused on my own room a lot today , though . That made me happy .

Options are:
[a]. They had nothing better to do
[b]. None of the above choices .
[c]. They were ordered to do so
[d]. The mess had been piling up and got too much
Answer the following question: Why did the person clean that day ?
[d].