Question $9$ of $75.$

Which of the following public charities has unrelated business income?

Wear It Proud, Inc., which operates a retail store that sells donated merchandise.

Vets for Pets, Inc., which operates vending machines on$-$site for the use of employees. $-$

Spirit Boosters, Inc., which charges for parking during sporting events that take place at an unrelated nearby stadium.

Operation Wilderness, Inc., which operates a summer day camp that is staffed entirely by volunteers.

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