There are 5 faces in the Pyramid. The name of these faces are as follows.
1) ABC 2) CBD 3) DBE 4) ABE 5) ACDE
So from the above faces we can see that point B is common point on the faces ABC, CBD, DBE,ABE. On the face ACDE point B is not present so point B is on the face ACDE.
So according to the diagram, point B lies on 4 faces of pyramid
