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
Answer:
when it's dark, the iris widens and the pupil dilates, or gets bigger, to allow as much light as possible to enter the eye.
It is b density ! Good luck sorry if late
The answer is competition
