The correct answer is unfitness.
The correct answer is (B) unfitness; the state or quality of being inept; inept remark, act, or other thing. Also, foolishness, silliness, or lack of good judgement.
Ineptitude comes from Latin ineptitudo
Examples of use:
- He displayed an extraordinary ineptitude in his handling of foreign affairs.
- The team's losing record last year was the result of laziness and ineptitude.