Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'number'?

A. A the concept is a mathematical object used to count, label, and measure.
B. A scheduled period in which an inmate of a prison or jail is permitted to spend a limited amount of time with a visitor.
C. A the concept is a collection of entities, for which there may be zero members.
D. A the concept is a quantitative description that reflects the magnitude of some attribute.

Answer: A the concept is a mathematical object used to count, label, and measure.