Task: Question Answering
Input (English): Question: Set A = {1, 2, 3, 4, 5, 6, q}
Which of the following possible values for q would cause Set A to have the smallest standard deviation?

 Option A:  1

 Option B:  2.5

 Option C:  3

 Option D:  3.5

 Option E:  7
Output (English): Option D