Researchers studied 300 people and matched their personality type to when in the year they were born. They discovered that the number of people with a"cyclothymic" temperament, characterized byrapid, frequent swings between sad and cheerfulmoods, was significantly lower in those born in the autumn. The study also found that those born in the summer were less likely to be excessivelypositive, while those born in winter were more likely to be irritable. Complete parts(a) through(e) below.

(b) What is thesample?

A.

All people

B.

The 300 people who are irritable, excessivelypositive, or have mood swings

C.

All people born in the winter

D.

The 300 people in the study