Answer:
B/C
Explanation:
During his Lifetime Muhammad (PHUH) united the Arabs and was the final prophet of God according to the Quraun.
The correct answer is a conditioned stimulus.
A conditioned stimulus (CS) refers to a previously neutral stimulus, that when repeatedly paired with an unconditioned stimulus (UCS) elicits the same response as the UCS, even in the absence of the UCS. In this example, the CS is Dr.Jones closing the classroom door, because this stimulus by itself elicits a response of anxiety in students.
