Which statements accurately describe the civil rights march from selma to montgomery, alabama?

choose all answers that are correct.

a.
governor george wallace welcomed the marchers upon their arrival at the state capitol.

b.
state troopers and local police escorted the marchers to ensure their safety.

c.
president johnson was shocked by the police brutality and called it "an american tragedy."

d.
the first time marchers tried to cross the bridge, they were attacked and beaten by the police.