Select the option that can be used as a one-word substitute for the given group of words.
Someone working or acting merely for money or other rewards

Correct option is B

The correct one-word for the given group of words is (b) Mercenary.
Mercenary: A person who works solely for monetary or material gain, often without regard for ethics. (पैसे के लिए काम करने वाला, स्वार्थी)
Example: He took up the job out of mercenary motives, not passion.
Meanings of the given other options:
· (a) Debtor – Someone who owes money (ऋणी)
· (c) Contractor – One who takes on work or projects (ठेकेदार)
· (d) Player – One who plays a sport or game (खिलाड़ी)
Only “mercenary” exactly fits the definition of someone who acts purely for material gain.