A the answer is A
it is because if you said
when they heard our play at the concert it does not make sense try all of them and see if they make sense
Well, i would like a school that is more willing to teach instead of throwing papers and making us work and hate the enviorment. if they where willing to teach and actually want to teach, it would be great. and maybe it would be easier for people to do the work and actually would like to learn. it would possibly be a healthier mindset as well if this choice was made.
but that is only my belief.
D, or the 4th one. It combines the sentences effectively, without overusing words.
