Task: Question Answering
Input (English): Question: If f is a function defined for all k by f(k) = k^(2/3)/16, what is f(64 k) in terms of f(k)?

 Option A: 1/8 f(k

 Option B: 5/8 f(k

 Option C: 2 f(k

 Option D: 16 f(k

 Option E: 32 f(k
Output (English): Option D