It's pretty annoying actually. Do you remember those horrible guys in high school who brought their acoustic guitars everywhere but could only play one riff over and over and over again? Horrible. If you can play, great. That's cool. But so can I, so don't try to fake it to impress me because it won't work.
If you can sing and play well, I would say you could defintely increase your attractiveness for ladies if they see you play and stuff. It wouldn't be a thing where'd they'd date you solely from your ability, but you'll at least have something that will br attractive to (I think) most girls.
If you just play guitar, I don't think the effect as strong. The voice and guitar go well together so if you take one out it sounds empty. However, if you want to compensate for lack of singing ability, do fingerstyle songs. I specifically remember on sonsterr. com there being "Thinking Out Loud -- fingerstyle version." I know because I've learned / played it amongst others lol. Those are pretty cool and I bet you could woo a heart if you wanted to with it xD
In any case I voted A.
Seems more like a douchebag to me there's a guy with a guitar round every corner.