Task: Class Definition Understanding (ontology: Earth_Environment/EnvironmentOntology)

Which of the following definitions best describes 'mesophilic sulfur spring'?

A. A lake which is contained in a crater formed by an impact event.
B. A sulfur spring through which water at a temperature optimal for the growth of mesophillic microorganism (approximately 20 to 45 degrees Celsius) flows.
C. A the concept is a fermented dairy product in which a microbial starter was introduced to the fermentation process.
D. A high-elevation mountain which has a maximum elevation between 2500 and 3500 metres above sea level.

Answer: A sulfur spring through which water at a temperature optimal for the growth of mesophillic microorganism (approximately 20 to 45 degrees Celsius) flows.