6428. He was sad that his seniority had been overlooked.

✅ The correct answer is 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