The population of a city increased by 140 people last year. Which situation, when combined with that increase in population, results in a zero overall change in population?
A. The population of the city decreases by 140 during the next year.
B. The population of the city decreases by 10 people per month during the next year,
C. The population of the city stays constant during the next year.
D. The population of the city increases by 140 during the next year.