Answer:
Random assignment.
Explanation:
Random assignment (also known as random allocation, or randomization), in psychology experiments, is randomly selecting participants or units by the use of chance procedures so that each participant or unit has the same chance (equal likelihood) of being assigned to any particular control or treatment group.
B or c because they both are very good answers sorry i couldn't help that much :(
An experimental procedure that removes the bursa of fabricius, either surgically, hormonay or through infection with the virus.
