The Generation Born from 1928 to 1940 Is Known as the "Silent

The generation born from 1928 to 1940 is known as the "silent" generation because:

A) a rash of birth defects caused by corporate negligence left many people mute
B) prevailing social norms at the time required youth to be seen and not heard
C) of their conformist and civic instincts
D) of their resistance to the development of rock and roll music styles