According to the passage, the risk of infection from airborne microorganisms would likely be greater during a ______.

A．spores are resistant to drying
B．the causative organism is encapsulated
C．droplets of sputum remain infective for a long time due to the resistance of the organisms to drying
D．none of these

A．bacteria can be most easily killed by removal of moisture
B．drying out a house will eliminate the risk of airborne infection
C．hot-Mr heating is better than steam heating because steam heating uses water
D．none of the above