It is likely that if schopenhauer had been more positive, he would not be the important philosopher that he is today. why is this the case?

a. he really disliked hegel, so he critiqued him a lot, which encouraged others.
b. other philosophers focused exclusively on happiness, so schopenhauer stood out.
c. he hated the world so much that he devoted all of his energy to proving it was awful.
d. many found his pessimism a refreshing change after centuries of optimistic philosophy.