What's the difference between mirror and monitor?

[Henna]

Business English Lesson, Advanced Level

ESL/EFL Test #155 "Budgeting", question 2

Every company should prepare a complete budget and constantly ......... its performance against that budget.

(a) match
(b) merge
(c) mirror
(d) monitor

Business English Lesson, Advanced Level

ESL/EFL Test #155 "Budgeting", answer 2

Every company should prepare a complete budget and constantly monitor its performance against that budget.

Correct answer: (d) monitor
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mirror

[Mister Micawber]

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No, 'monitor'.
.
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Native English teacher at Mister Micawber's