Which of the following best describes a step cost?

Which of the following best describes a step cost?
A . A cost which remains constant until activity reaches a critical level; thereafter the cost increases to a higher level and the unit cost remains constant until the next critical activity level is reached.
B . A cost which increases steadily until activity reaches a critical level; thereafter the cost increases to a higher level and the total cost remains constant until the next critical activity level is reached.
C . A cost which remains constant until activity reaches a critical level; thereafter the cost increases to a higher level and the total cost remains constant until the next critical activity level is reached.
D . A cost which increases per unit until activity reaches a critical level; thereafter the cost increases to a higher level and the unit cost remains constant until the next critical activity level is reached.

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Answer: C