Correct Answer: Assertive

Solution : The fourth option is correct.

Humble refers to having a modest or low view of one's importance, being unpretentious, and showing a lack of pride or arrogance.
Assertive, on the other hand, refers to a confident and self-assured manner of expressing one's opinions, needs, or desires. It involves being firm and decisive without being aggressive.

The meanings of the other words are as follows:

Votary: It refers to devoted followers.

Passive: It means accepting without resistance or lacking energy.

Diffident: It means shy or lacking in self-confidence.

Therefore, the correct answer will be assertive.