Which of the Following Statement Is TRUE in Reference to Slavery

Which of the following statement is TRUE in reference to slavery during the era of Pax Romana?

A) Slaves were freed if they served in the military.
B) Wars and foreign excursions actually decreased the number of slaves.
C) Children born to slave women and Roman citizens were put to death.
D) Freed slaves were forced to leave the city of Rome.
E) Laws were passed to protect slaves from cruel masters.