Read the text and determine if the sentence is true (see options at the end):

How to use a graphic flight computer to find ground speed and true heading<br>Align the wind direction under the " true index " mark by rotating the azimuth plate. If the winds are from 330 at 20 knots, align 330 under the true index. Align the grid so the center grommet is over one of the heavy lines.

Sentence: ground speed and true heading can only be found with a graphic flight computer
Choose from:
A). Yes
B). It's impossible to say
C). No
B).