A stationary front is depicted in the picture at L. A stationary from is a narrow zone separating two air masses in which neither air mass is displacing the other. When this occurs there is a stall in the motion of the front. The blue triangles point away from the cold air and the red semicircles point away from the warm air.
It can't be B or C.. or D so try A. Plant succession <span>is the process of change in the species structure of an </span>ecological<span> community over time. The time scale can be decades (for example, after a wildfire), or even millions of years after a mass extinction.</span>
Japan, India, etc
Hope this helps!