Wind is A.
two air masses meeting
B.
air in motion
C.
a high pressure area
D.
a low pressure area

B makes the most sense because wind is constantly moving, and you can also use process of elimination. Wind has no pressure it’s only speed, so knock those out. Two air masses meeting would mean that they may have equal speeds against each other not really causing movement so it would be B. Hope this helps <3

Heatamount of salt . . .

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons