Why is a quarter an object?

[Stupy]

English Grammar Tests, Elementary Level

ESL/EFL Test #239 "Vocabulary Practice: Animal or Object? (4)", question 3

A ......... is an object. This is a coin and is worth 25 cents in the US.

(a) koala
(b) kitten
(c) quarter
(d) quail

English Grammar Tests, Elementary Level

ESL/EFL Test #239 "Vocabulary Practice: Animal or Object? (4)", answer 3

A quarter is an object. This is a coin and is worth 25 cents in the US.

Correct answer: (c) quarter
_________________________

please explan

[Linda]

In this question, you have to choose the 'object' of the four possible answers provided to you. You are also given a little information about the object.
The other three possible answers are animals, so they are not correct.
_________________
One Way of Learning English Grammar
Learn English with Linda Arlia