Oliver, a student, is preparing to take an exam. He is stressed about the exam and is unable to fall asleep. Even if he falls asleep, he often wakes up during the night or wakes up too early. In this scenario, which of the following disorders is the cause of Oliver's condition?
A. somniloquy
B. somnambulism
C. insomnia
D. narcolepsy

Insomnia

Explanation:

Insomnia is a sleeping disorder in which a person having trouble falling asleep or having trouble staying asleep. This condition varies according to the patient's condition. It can be for a long time or short periods. It is a chronic condition. It occurs three nights a week.  

Insomnia is many types  

Primary insomnia

Secondary insomnia

Insomnia have may reason to occur. Thus here Oliver is suffering from insomnia because of exam stress.

if you are on the computer you can not take a picture but you can upload one but i am not sure about phones but i'm pretty sure it's the but to upload one just click the paper clip looking thing/ link thingy thing and upload a pic

because he is that the right