A statistical question is one that anticipates variability in the data and typically requires data collection to answer. In this case, the question that qualifies as a statistical question is:
D. How many teammates who were at the last game are left-handed.
This question anticipates variability (not all teammates may be left-handed) and requires data collection to determine the number of left-handed teammates from the group that was at the last game.
The other options either seek a specific count (which does not involve variability) or do not lend themselves to statistical analysis in the same way.