During the Freedom Rider incident:

a. southern whites adopted the tactics of the civil rights movement and peacefully blocked buses.
b. only the presence of federal troops prevented violence.
c. local police collaborated with the white mobs that attacked buses.
d. white mobs attacked black freedom riders but left white ones alone.

c.local police collaborated with the white mobs that attacked buses.

Explanation:

Freedom Riders were groups of white and African American civil rights  who participated in Freedom Rides in 1961 with the aim to desegregate interstate transportation, including highways, bus stops, and train terminals and to test the Supreme Court's ruling in Boynton v. Virginia (1960), which declared segregation in interstate bus and rail stations unconstitutional.

During the Freedom Rider was met with an incident where local police collaborated with the white mobs that attacked buses in Birmingham, Alabama, where the police chief saw the Freedom Ride as a challenge to his authority in the city.

aliens are not real, the myth was created about 700 years ago because people found markings in the field of their crops. also, no there were no aliens on the moon.

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the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.