Which of the Following Best Describes How the Flu Virus

Which of the following best describes how the flu virus may impact the respiratory system?

A) The immune system prompts a decrease in blood flow, which results in the lungs becoming dry. A hacking cough can be produced.
B) The proteins produced by the virus interfere with the ability of epithelial cells to move materials in and out of lung tissue, resulting in fluid buildup in the lungs.
C) Epithelial cells see an increase in function as they try to adapt to the viral load of surrounding cells.
D) All of the answer choices are correct.