Just to be ultra-pedantic (as I sometimes am), the Huey Lewis & The News one didn't get to number one - not in the UK, at least.
Presuming this is a quiz question though, I'm sure The Power Of Love is the answer they're looking for - it can't be anything else, so it's the question that's wrong, not hobbitess's answer.
I suppose if you include both the UK and US charts, it's technically right. Huey Lewis was #1 in the USA, the other two were #1s in the UK (and did very little in the USA - in fact the Jennifer Rush song was outperformed stateside by a cover version by, of all people, Air Supply!)