If Experiment 2 were repeated with Drug U and an incubation time of 3 hours, the number of colonies counted would most likely be:
A. More than 50.
B. Between 41 and 50.
C. Between 18 and 41.
D. Fewer than 18.

Experiment 2
Bacteria were handled as described in Experiment 1 with two exceptions: all drugs were tested at the same concentration and the incubation time of each culture was varied. Table 2 shows the number of colonies counted for Experiment 2.

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Table 2 Incubation time (h) 12 Number of colonies: 22 8 0 39 12 1 40 15 2 U 41 18 3 V 45 22 5 None 50 50 50 Note: Numbers of colonies are averages for 7 replicates (identical samples). Drug R S T 1 6 2 4 6 7 9 50 24