Context: Meteorologists can make predictions about weather events. For example, the passage below describes how a meteorologist might use observations of Earth's atmosphere to predict a tornado event.
Figure: a tornado passing through a field.
Which of the following statements is supported by the passage?
A. Some air masses contain dry air; other air masses contain moist air.
B. Meteorologists are scientists who study meteors.
From the given choices, pick the correct answer and respond by indicating the letter of the correct option.

A