The Population of a Colony of Bacteria Triples in 3

Multiple Choice

The population of a colony of bacteria triples in 3 days. Assuming that the rate of growth is proportional to the size of the population, how long did it take for the colony to double in size?

A) 2 days
B) 1.9 days
C) 4.9 days
D) 6 days
E) none of these