From the following social phenomena, which one was born out of a social demographic episode popularly called “the Baby Boom?

From the following social phenomena, which one was born out of a social demographic episode popularly called “the Baby Boom?”

A.     The massive emergence of child-centered industries in Europe and across America in the 1950s through 1960s.

B.     The habit of increasingly watching TV.

C.      The economic inflation that happened in the 1980s.

D.     The increase in family size in the 1950s and 1960s.