Correct Option: C

smooth (Adjective) : flat and even ; without problems ; polite and pleasant
rough (Adjective) : not smooth ; uneven and irregular
refined (Adjective) : made pure by taking out other substances ; polite, well–educated and able to judge the quality of things ; cultured
charming (Adjective) : very pleasant or attractive
polite (Adjective) : courteous ; having or showing good manners and respect for the feelings of others