Not D and not B but pretty sure C sorry if i’m wrong
A pandemic<span> is an </span>epidemic (<span>An </span>epidemic<span> is a disease that spreads rapidly among many people in a community at the same time.)</span><span> of </span>infectious disease<span> that has spread through human populations across a large region; for instance multiple </span>continents, or even worldwide.
Brehnev welcomed Nixon to visit Moscow. The Soviet Union reacted to the standardization of relations amongst China and the United States by having Brehnev welcome Nixon to Moscow. President Nixon trusted that normalizing relations with china drive a wedge amongst China and the Soviet Union.