resent + one/one's?

[vkhu]

Which one of these two is correct?

I resent my colleague's getting that promotion before me.
I resent my colleague getting that promotion before me.

If both are correct then please tell me the circumstances in which each of them could be used.

[5jj]

Effectively, for most people, there is no real difference. Some people prefer one form, some the other.

Some people feel that there is a difference in meaning. They feel that it is the getting of the promotion that is being resented in #1; such people usually use 'of' after 'getting', considering it to be a 'verbal noun'. They feel that it is the colleague who is being resnted in #2 (for getting the promotion); they do not use 'of' after 'getting', considering it to be a gerund (verbal noun).

[vkhu]

Effectively, for most people, there is no real difference. Some people prefer one form, some the other.

Some people feel that there is a difference in meaning. They feel that it is the getting of the promotion that is being resented in #1; such people usually use 'of' after 'getting', considering it to be a 'verbal noun'. They feel that it is the colleague who is being resnted in #2 (for getting the promotion); they do not use 'of' after 'getting', considering it to be a gerund (verbal noun).

ok, that's a little bit confusing. Maybe I should give you the original question that baffled me:

Rewrite using resented:
"Anna didn't like it at all when one of her colleagues got the promotion instead of her."

Answer key:
"Anna resented one of her colleagu.....etting the promotion instead of her."

The "....." part is blurred. I can't see if it is colleagues or colleagues'

In this case, which one is more acceptable?