Why Did Multiple Births Increase Among White Women After 1972

Why did multiple births increase among white women after 1972 but not among black women?

A) Having many children was suddenly deemed a status marker for whites but not for blacks.
B) White women were marrying in record numbers while still in their late teens whereas black women were staying single much longer than in the past thus
delaying their child bearing years.
C) White women were marrying and staying married whereas black women were cohabitating and divorcing.
D) White women had access to fertility clinics whereas black women did not.
E) White women became employed in record numbers thereby creating resources for having more children, whereas black women were experiencing record rates
of unemployment and therefore had few resources which restricted them from
having children..