Five Different Strains of Bacterial Cultures Were Grown Overnight in a Medium

Five different strains of bacterial cultures were grown overnight in a medium containing antibiotics.Of the resulting population densities listed below,which was the most fit?

A) 5 x 10⁵ cells/ml
B) 6 x 10⁶ cells/ml
C) 7.5 x 10⁷ cells/ml
D) 0.075 x 10⁸ cells/ml
E) 5 x 10⁷ cells/ml