Sit-ins and freedom rides advocated
a. violent protests.
c. non-violent protest.
b. armed protest.
d. revolution

Sit-ins and freedom rides advocated C. NON-VIOLENT PROTEST.

Non-violent protests or non-violent resistance is the practice of achieving goals such as social change through symbolic protests, civil disobedience, economic or political non-cooperation, or other methods without using violence.

Other methods of Nonviolent protests and persuasions are:
1) student strikes
2) sit-downs
3) turning one's back
4) vigils
5) "haunting" officials
6) disrobing

Word of mouth.