Possessive pronouns vs. possessive adjectives

[Liania]

English Grammar Tests, Elementary Level

ESL/EFL Test #101 "Possessive pronouns", question 1

Mia left ......... notebook on the bus.

(a) her
(b) yours
(c) his

English Grammar Tests, Elementary Level

ESL/EFL Test #101 "Possessive pronouns", answer 1

Mia left her notebook on the bus.

Correct answer: (a) her

Your answer was: incorrect
Mia left yours notebook on the bus.
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i can't understand, why these sentences shows wrong . although i give right answers

[Yankee]

.
Which answer did you give?

The test shows that your answer was yours but that is a wrong answer.

The correct answer is her.
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Amy
.
ESL teacher, translator, and a native speaker of American English