Question

which is the best estimate for the volume of a bathroom sink? 1 liter 20 liters 800 liters

Explanation:

1 liter is too small (only the volume of a small water bottle), and 800 liters is far too large (equivalent to a large bathtub). A typical bathroom sink can hold enough water for washing hands/face, which is reasonably estimated at 20 liters.

Answer:

20 liters