Select the option that can be used as a one-word substitute for the given group of words.
An imperfection; a blemish, a crack

Correct option is C

The correct one-word for the given group of words is (c) Flaw.
Flaw means a defect, crack, or imperfection in something, especially in a product or character.
Example: There is a flaw in this design that could cause it to collapse.
Meanings of the given other options:
· (a) Flaunt: To show off (दिखावा करना)
· (b) Fleck: A small patch of color or light (धब्बा, बिंदी)
· (d) Flea: A small jumping insect that feeds on blood (पिस्सू)