Which of the following is the best expression of the main idea of this passage?

A、Peopleinbeautifulroomstendtogivehighermarkstophotosoffacesthanpeopleinuglyrooms.
B、Thecolorandgeneralappe'aranceofaroomhaveadeepereffectonthebehaviorofthepeopleinit.
C、TheUniversityofKansashasstudiedtheeffectsofthecolorofaroomonpeople'sbe-havior.
D、Beautifullyfurnished,light-colouredroomsmakepeoplemorecomfortablethanugly,darkrooms.