Goldfish Are Very Hardy Fish, Which Is Why They Have

Goldfish are very hardy fish, which is why they have been in the pet trade for so long. They are generalist feeders and can tolerate a wide range of oxygen concentrations as well as high levels of nitrogen (due to waste buildup in a small fish bowl) . Based on this, goldfish ____________________.

A) have a large microhabitat
B) have a broad ecological niche
C) face almost no constraints or tradeoffs
D) live in macrohabitats