Possessive pronouns vs. possessive adjectives

[grisha]

English Grammar Tests, Elementary Level

ESL/EFL Test #101 "Possessive pronouns", question 8

The fluffy brown puppy is ..........

(a) its
(b) my
(c) theirs

English Grammar Tests, Elementary Level

ESL/EFL Test #101 "Possessive pronouns", answer 8

The fluffy brown puppy is theirs.

Correct answer: (c) theirs

Your answer was: incorrect
The fluffy brown puppy is my.
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Why is it incorrect with my?
It can be also with my.

grisha

[Yankee]

Hi

The only correct answer is "theirs".

You could also say:
- mine (not "me")
- yours
- his
- hers
- ours

But none of these were choices in the test question.

Amy
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln

[Baotet]

[Beeesneees]

It's never likely to be the case, is it, Baotet? It's not practical and even with the stretch of the imagination which is necessary to imagine such a scenario, it certainly isn't the best answer from those provided.
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Cheers m' dears!