I had to think about this one for a while! I'm weird. For LOL and LOL only, I'm a B. I just read it as letters. For all the other chatspeak that I can think of, I'm an A, I read out the words
Definitely C, I've always read them as words, even it comes out, uh, stupid. Lamb-ow, rot-full, zoh-mgh, lohl, etc. Hee. I've wondered how everyone read them, too.
Something else. I don't read them as anything. They're like "" and ":-(". I just see them. "Lol" = Amused. "Brb" = They'll be back soon. "OMG" = Something important.
I really need to get off the computer.
...LOL.