Correct Option: C

respectful (Adjective) : feeling or showing respect
impertinent (Adjective) : rude and not showing respect ; impolite
arrogance (Noun) : the act of behaving in a proud, unpleasant way, showing little thought for other people
appropriate (Adjective) : suitable, acceptable or correct for the particular circumstances
modest (Adjective) : not very large, expensive, important, etc ; not talking much about your own abilities or possessions