Task: Question Answering
Input (English): Problem: a certain fraction is equivalent to 2 / 5. if the numerator of the fraction is increased by 4 and the denominator is doubled, the new fraction is equivalent to 1 / 4. what is the sum of the numerator and denominator of the original fraction ?
Options: a. 49, b. 35, c. 56, d. 26, e. 21
Output (English): c