Roman slaves
a. rarely rebelled, due to the fair treatment they received.
b. were never involved in agriculture but only in manufacturing enterprises.
c. made up well over half the population of the empire.
d. received their freedom as reward for the military assistance at the battle of actium.
e. staged a number of massive rebellions, the largest led by spartacus in 71
b. c.e.

The correct answers are
b. were never involved in agriculture but only in manufacturing enterprises.
c. made up well over half the population of the empire.
and
e. staged a number of massive rebellions, the largest led by Spartacus in 71

Their slavery system was different than that in newer times because for them anyone could be a slave. They would enslave people regardless of race, gender, nationality, class, or similar. If you committed a crime or were in debt or were conquered, you could become a slave.

The answer should be europe