Two fingers have equal pressure on the pencil,

The finger pressure on the pencil and the pencil opponent pressure are a pair of interaction forces.

∴ These two forces are equal, that is, the pencil pressure on two fingers is the same, that is, f1= F2;

As can be seen from the figure, the stress area of the right finger is relatively small, and according to p=FS, the stress on the right finger is relatively large, that is, p1< p2;

So choose C.