Pail, jug, and bird bath are too small (less than 20 liters). Aquarium holds the most water (average 50-100 liters, some reach 500 liters), but specific size details are needed for confirmation.
The correct answer is option B. "an aquarium in a waiting room"
The question asks which container holds approximately 500 liters of water. Analyzing the options individually:
A. Small pail: Typically holds around 5-10 liters, making it far too small for 500 liters.
B. Aquarium in a waiting room: Average size is 50-100 liters, with some larger ones reaching 500 liters. While not guaranteed, it's the most likely candidate.
C. Jug: Holds around 1-2 liters, making it significantly insufficient for 500 liters.
D. Bird bath: Holds around 5-20 liters in most cases, disqualifying it as a possibility.
Therefore, the only option potentially holding 500 liters is B. an aquarium in a waiting room. However, without further information regarding the specific size of the aquarium, it's impossible to definitively confirm it holds 500 liters.