Royalties can be earned from allowing others the right to use:

A) Books
B) Plays
C) Trademarks
D) All of these

Royalties

Payments made to the owner of certain types of intellectual property, rights, or assets for the use of said property by others.

Trademarks

A legal designation of exclusive use of a brand or product name, protecting it from use by others.

Books

Physical or digital records that keep track of financial transactions and accounts for a person or organization.