Select the option that can be used as a one-word substitute for the given group of words.
One who does something not professionally but for pleasure

Correct option is C

The correct one-word for the given group of words is (c) Amateur.
Amateur is a person who engages in a pursuit, especially a sport, on an unpaid basis for pleasure rather than as a profession. (शौकिया)
Example: He is an amateur photographer who captures stunning landscapes.
Meanings of the given other options:
· (a) Professional: A person engaged in a specified activity as their main paid occupation. (पेशेवर)
· (b) Immature: Not fully developed or grown. (अपरिपक्व)
· (d) Mature: Fully developed physically or mentally. (परिपक्व)