He has won great admiration amongst his students because of his verdant outlook.

Answer: Option C

Wide : of great or more than average width.
Optimistic : hopeful and confident about the future.
Fresh : (of food) recently made or obtained; not tinned, frozen, or otherwise preserved.
Logical : of or according to the rules of logic or formal argument.
Verdant : (of countryside) green with grass or other rich vegetation.

Synonym of Verdant is Fresh