Select the option that can be used as a one-word substitute for the underlined group of words.

Samantha keeps herself occupied by helping other people willingly without expecting any payment for her services.

Volunteer

The word that can be used as a one-word substitute for the underlined group of words is volunteer.

• Opportunist is a person who takes advantage of opportunities, especially those that arise unexpectedly.
• Volunteer is a person who offers their services willingly and without payment.
• Mercenary is a person who fights for money, not for ideals.
• Iconoclast is a person who attacks or challenges traditional ideas or institutions.