Pamela, Pearl, and Polly went to buy some toys. Pamela paid $$2$$ dollars and $$70$$ cents for three identical dolls. Pearl paid $$3$$ dollars and $$40$$ cents for two identical toy cars. How much did Polly pay for one doll and one toy car? (Adapted from 2011 Math Kangaroo Problem, Level 3-4 , Question \#6) 
选项为:A:$2$ dollars and $80$ cents  B:$2$ dollars and $70$ cents  C:$2$ dollars and $60$ cents  D:$2$ dollars and $50$ cents  E:$2$ dollars and $40$ cents  请回答其中一个选项.