There was something strange and morbid about the whole house.

Answer: Option B

morbid : characterized by an abnormal and unhealthy interest in disturbing and unpleasant subjects, especially death and disease.
healthy : in a good physical or mental condition; in good health.
cheerful : noticeably happy and optimistic.
insipid : lacking flavour; weak or tasteless.
appealing : attractive or interesting.


Antonym of morbid is cheerful