The Following Histogram Depicts the Prevalence Rates of a Particular

Multiple Choice

The following histogram depicts the prevalence rates of a particular genetic marker in samples among 25 impoverished communities in 2004. In each interval, the left endpoint is included but not the right endpoint, so the class intervals are 10 ≤ rate < 15, 15 ≤ rate < 20, . . . .
​
How many communities have a prevalence rate of 30% or higher?

A) 5
B) 12
C) 10
D) 13