Which of the Following Statements Is True

Which of the following statements is true?

A) As the lung expands, the pressure within the lung increases, so air moves in until the pressure inside the lung is equal to the pressure outside the body.
B) As the lung expands, the pressure within the lung decreases, so air moves in until the pressure inside the lung is equal to the pressure outside the body.
C) As the lung expands, the pressure within the lung decreases, so air moves out until the pressure inside the lung is equal to the pressure outside the body.
D) As the lung expands, the pressure within the lung decreases, so air moves out until the pressure inside the lung is greater than the pressure outside the body.