He was sad that his seniority had been overlooked.

Answer: Option B

Rejected : dismiss as inadequate, unacceptable, or faulty.
Neglected : suffering a lack of proper care.
Confused : (of a person) unable to think clearly; bewildered.
Sidestepped : avoid (someone or something) by stepping sideways.
Overlooked : ignore or disregard (something, especially a fault or offence).

Synonym of Overlooked is Neglected