【单选题】Since World War II, there has been a clearly discernible trend, especially among the growing group of college students, toward early marriage. Many youths begin dating in the first stages of adolescen...
A.
can be clearly seen
B.
is the result of the Great Depression of the 30's
C.
can't be easily determined
D.
is an outgrowth of the moral looseness brought about by World War Ⅱ