Many whites were scared away from supporting the civil rights movement because of
a) the black power movement
b) the election of lyndon johnson
c) the popularity of martin luther king jr.
d) the use of nonviolent protests

A) the black power movement.

Explanation:

Many whites refused to support the civil rights movement, movements that sought equality and justice for African-Americans, out of fear for the inertia and strength that all the various black power social movements in the USA garnished during the sixties and beyond, making black power movements a political power to be reckoned with: this certainly frightened most conservative whites in fear that their own privileges could be lost when in reality all they lost was the unique opportunity to make their society a more just society.    

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live