Fill in the blank with the most appropriate option:
The theory remained ____ the fringes of academic discourse until empirical validation emerged.
Show answer & explanation
Correct answer: B
Explanation
Correct Answer: on
Explanation
• The correct preposition here is on because on the fringes of is a standard idiomatic phrase.
• It means to be on the outer border, margin, or secondary to the main group or activity (not part of the mainstream).
• Example: He lived on the fringes of society, away from modern technology.