Task: Question Answering
Input (English): Problem: if a drawing has an outer circle of diameter 30 and an inner circle of diameter 24, then what fraction of outer circle ' s surface is not covered by the inner circle ?
Options: ['a. 3 / 6', 'b. 8 / 24', 'c. 14 / 16', 'd. 9 / 25', 'e. 2 / 3']
Output (English): d