Task: Question Answering
Input (English): Problem: the ratio between the present ages of a and b is 5: 3 respectively. the ratio between a ' s age 4 years ago and b ' s age 4 years hence is 1: 1. what is the ratio between a ' s age 4 years hence and b ' s age 4 years ago ?
Options: a. 3: 9, b. 3: 6, c. 3: 1, d. 3: 4, e. 3: 2
Output (English): c