16. The population of bacteria in a petri dish is modeled by the function \( B ( t ) = 300 ( 2 ) ^ { t } , \) where \( t \) represents time in hours and \( B ( t ) \) represents the population of the bacteria. What's the average rate of change in the population from \( t = 1 \) to \( t = 3 \) ?
A. \( 900 \) bacteria per hour
B. \( 1,800 \) bacteria per hour
C. \( 300 \) bacteria per hour
D. \( 600 \) bacteria per hour