Which of the Following Statements Best Describes the Effects of Positive-Pressure

Which of the following statements best describes the effects of positive-pressure ventilation on cardiac output?

A) Positive-pressure ventilation increases intrathoracic pressure, which increases venous return and cardiac output.
B) Positive-pressure ventilation decreases venous return, which increases preload and cardiac output.
C) Positive-pressure ventilation increases venous return, which decreases preload and cardiac output.
D) Positive-pressure ventilation increases intrathoracic pressure, which decreases venous return and cardiac output.