Answer:
I do not see choices, but I hope that this helps.
I do not believe that Hamlet was crazy and saw hallucinations of a ghost. He had some problems, but other people saw this ghost before he did. Other people have discussed what they saw and this is not in Hamlet's imagination. He could be really sad that his Father has died, but did he really lose his mind? Probably not.
Explanation:
Since others saw this same ghost, it is not in his head. The ghost is realllllll.
In relating to behavior, normal means ordinary. Someone who displays normal (and usually healthy) behavior like the majority of people. Abnormal behavior is just the opposite.
For example: Person A sees a poisonous snake. They get away from the snake in fear. This person has normal behavior. Person B sees the same snake. They get on the ground and play with the snake. This person has abnormal behavior.