Which word is the indirect object in the following sentence?
Riley passed his Uncle the Coffee.
B. Uncle
The Uncle would be the "indirect object"
explanation: The uncle receives the object.
Indirect Object Definition:
"An indirect object is the word or phrase that receives the direct object."
In this question the direct object is the coffee but the indirect object the one who receives the direct object is the "Uncle".
So the answer is B. Uncle.