In the graph above, the time when the number of living bacteria is increasing at the greatest rate occurs

(A) during the first 2 hours
(B) between the 2nd and the 4th hour
(C) between the 4th and the 6th hour
(D) between the 6th and the 10th hour
(E) between the 11th and the 13th hour
Test ID: 1207
Source: The SAT Subject Tests Student Guide