Wind Speed Varies in the First Twenty Meters Above the Ground

Multiple Choice

Wind speed varies in the first twenty meters above the ground. For a particular day, let $f(x) =1.4 \ln x+9.0$ compute the wind speed $x$ meters above the ground. What is the wind speed 11 meters above the ground? Round your result to the nearest hundredth.

A) -5.64 meters per second
B) 11.40 meters per second
C) 12.08 meters per second
D) 12.36 meters per second