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

A．The civilian response to the Civil War.
B．The causes of the Civil War.
C．Where the Civil War battles were fought.
D．Why the South lost the Civil War.

A．derived from a Japanese word, meaning a businessman with great wealth and power
B．an English translation of a Russian word, meaning a man of great consequence
C．borrowed from Portuguese, meaning an industrialist with a great man of money obtained illegally
D．rarely used now because of its derogatory meaning