Select the most appropriate option to fill in the blank.
A/An ________ fellow cannot become an ideal teacher.

Correct option is A

The correct option to fill in the blank is (a) idle.
"Idle" means avoiding work; lazy, which implies that such a person cannot be an ideal teacher.
Meanings of other options:
· Idle: Avoiding work; lazy.
· Bright: Intelligent and quick-witted.
· Intelligent: Having or showing intelligence, especially of a high level.
· Honest: Free of deceit and untruthfulness; sincere.