Select the option that can be used as a one-word substitute for the given group of words.
A quick, sudden movement

Correct option is A

The correct one-word for the given group of words is (a) Flick.
Flick means a sudden, quick movement, especially with a part of the body or a switch.
Example: She gave her hair a quick flick before entering the room.
Meanings of the other options:
· (b) Fleck: A small mark or spot (धब्बा)
· (c) Dust: Fine particles of matter (धूल)
· (d) Speck: A very small particle or spot (बिंदु)