Ela and Kasia boarded a super-train. Ela took a seat in the seventeenth car counting from the front of the train, and Kasia was seated in the thirty-fourth car counting from the end. The girls were sitting in the same car. How many cars did the super-train have? (2001 Math Kangaroo Problem, Level 3-4, Question \#13) 
选项为:A:$$48$$  B:$$49$$  C:$$50$$  D:$$51$$  E:$$52$$  请回答其中一个选项.