(n) Figures A and B show people standing on a level ground.

Ground pressure:

F A = F B = 1；

(2) Figure A is standing with both feet on the ground, and Figure B is standing with one foot on the ground. The stress areas on the ground are:

S a > s b，

∫p = FS，

∴ On the ground:

P a < p b，

That is, when changing from the posture in Figure A to the posture in Figure B, the pressure remains unchanged and the pressure becomes H. 。

So choose D.