In the US , the number one hit on my birthday was " With Or Without You " by U2 , which is rather cool because it 's quite possibly my favourite U2 song .

Question: Why did the author note that the number one hit was their favorite song by U2 ?
Answer: To make it clear who some of their preferred musicians are .They also like other songs from this band and this one is their most liked .To emphasize that U2 is recognized for having many chart topping hitsNone of the above choices .