一点 adj, seems like: a little , a small piece of
更 adv, ex. 更多,更少,更强 expresses the comparision. it seems 'much' in english.
And for both examples, i prefer to use expression used in B and C. they are more politesse, it's important for the situation when you speak to sb you never meet before. Option A is also right but it's not very friendly. It likes a order!
A little difference between 一些 and 一点
一些 + countable nous , 一点 + uncountable nous but there are always exceptions....