I like this girl and i'm not sure if she likes me, what should i do..please help!?

o about a few months ago i met these 2 girls in one of my cles, we got to know eachother throughout the semester and i got the emails n #'s. i liked one of the girls and was a bit better friends with the other girl. when i got there numbers girl B(her friend) gave both n said that girl A(the one i like) doesnt pick up. so i called em up sometimes for hw. n stuff and tried to get together for studying but our scehdules woudn't meet. so on the last day i said i that i knew they were busy an was wonderin if they wanted to hang out sometime. girl A just nodded and girl B just smiled an said somethin that i forgot. girl B has a bf. and girl A is pretty busy. so a few weeks went by an i called girl B just to talk and at the end she said to give them a call sometime an see if they wanted to do soemthin. the thing is evertime i call girl A she either never picks up n doesn't call back or when i txt she sometimes msg's back. im kinda friends with em but dont knoe em that well. wat sud i do?