1. This is a constant pressure chart.  The pressures at Points A, B, C, and D are all the same - 500 mb. 

2. Point A is found at the lowest altitude - 5400 meters.  Point D is found at the highest altitude - 5640 meters.

3. The coldest air is found below Point A, the warmest air is below Point D.

4. The winds blow parallel to the contours from west to east as shown on the map above.  The winds at Point C are blowing from the west.