Select the most appropriate option to fill in blank number 3.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. frivolous.
The sentence contrasts "serious-minded people" with another type of individual. "Frivolous" (meaning carefree or lacking seriousness) is the appropriate choice as it is the opposite of "serious-minded."
The other options don't create a logical contrast:
Solemn, thoughtful, and grave all suggest seriousness, which would not contrast with "serious-minded people."