Which situation can be modeled by a linear function? A) The cost of living in the city doubles every 10 years.

B )The employees at a local hardware store earn a $2-per-hour wage increase every year they work for the store.

C) Each bacteria in the petri dish divides in half every five seconds.

D) A rumor spreads when you tell 5 of your friends, who each tell 5 more of their friends, and each of those friends tell 5 more of their friends, etc.