During a Period of Disestablishment,established Religions Are Challenged by Social

During a period of disestablishment,established religions are challenged by social change.Of the following,one of these in U.S.history is the:

A) period during the 1960s and 1970s associated with the anti-Vietnam war movement, the push for racial equality, and new forms of experimentation
B) period during the 1980s under President Reagan
C) election of a southern Christian president, Bill Clinton, in 1992
D) assassination of Abraham Lincoln at the end of the U.S. Civil War
E) start of the U.S.-Mexican war in 1840s