Poll: Which is correct?

Trish

The "idea" of walking out is singular so i chose the latter

adem

which one of them is it right?

jordão pereira

That she walked out when he arrived bothers(bothered) me. Bothers is prefferable in that it is a present state of mind. On the other hand, bothered is also possible on account of the agreeing verbs in the past preceding the "bother"

oana

The subject is third person singular so the verb is used accordingly.