Task: Question Answering
Input (English): Problem: if the length of an edge of cube p is thrice the length of an edge of cube q, what is the ratio of the volume of cube q to the volume of cube p ?
Options: ['a. 1 / 4', 'b. 1 / 5', 'c. 1 / 6', 'd. 1 / 27', 'e. 1 / 9']
Output (English): d