U. s. troops on a search-and-destroy mission to find vietcong fighters killed at least 450 women, children, and elderly men
(a) my lai massacre
(b) silent majority
(c) vietnamization
(d) pacification

The correct answer is A. At the My Lai Massacre, U.S. troops on a search-and-destroy mission to find Vietcong fighters killed at least 450 women, children, and elderly men .

Explanation:

The My Lai Massacre was the mass murder of between 347 and 504 Vietnamese civilians on March 16, 1968, during the Vietnam War by troops from the United States Army. The majority of the victims were women, children and the elderly, some of whom were mutilated and some women raped before being murdered. Although initially 26 soldiers from the United States were allegedly charged for the events, finally only the officer William Calley was sentenced to a death sentence accused of killing 22 civilians, but served only three and a half years of house arrest.

it refers to race, i am pretty sure this was a popular term in nazi germany or something.