$X$ Is a Normally Distributed Random Variable with a Mean Of Of 11.00

Multiple Choice

$X$ is a normally distributed random variable with a mean of $11.00$ . If the probability that $X$ is less than $11.88$ is $0.67$ (as shown below) , then what is the standard deviation of (Note: the diagram is not necessarily to scale.)

A) 4.00
B) 1.00
C) 2.40
D) 2.00