He holds extreme views on education.

A. ordinary

B. casual

C. timid

D. moderate

Answer: Option D

Solution(By Examveda Team)

Extreme : reaching a high or the highest degree; very great.
Ordinary : with no special or distinctive features; normal.
Casual : relaxed and unconcerned.
Timid : showing a lack of courage or confidence; easily frightened.
Moderate : average in amount, intensity, quality, or degree.

Antonym of Extreme is Moderate