Which statement about temperature, humidity, and pressure in an air mass is true?
a. the temperature is the same throughout but the humidity and pressure vary widely.

b. the pressure is the same throughout but the humidity and temperature vary widely.

c. the temperature, humidity, and pressure vary widely throughout the air mass.

d. the temperature, humidity, and pressure are uniform.

A. The temperature is the same throughout but the humidity and pressure vary widely.

Explanation:

An air mass is a body of air with horizontally uniform  in some characteristics which are; levels of temperature, humidity, and pressure. Relatively, they have uniform temperature and moisture content. Two or more regions of air masses are separated by a front.

Temperature within the air mass is the same, while humidity makes the pressure to increase.

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your answer would be “dry”