Difference between donate and contribute

[Sandra]

Test No. incompl/advan-60 "Working Well", question 8

It soon became apparent that under the new management people were also starting to ......... some of their free time to the company.

(a) donate
(b) deliver
(c) contribute
(d) convert

Test No. incompl/advan-60 "Working Well", answer 8

It soon became apparent that under the new management people were also starting to contribute some of their free time to the company.

Correct answer: (c) contribute

Your answer was: incorrect
It soon became apparent that under the new management people were also starting to donate some of their free time to the company.
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Hello, why we couldn't use "donate" instead of "contribute"?Thank you!

[Torsten]

You can donate money or blood to a charity or a good cause. In the sentence you are referring to, you need the verb contribute because we are talking about the fact that employees spend their free time working for a company. That's a different situation.

TOEIC listening, photographs: Two types of transportation