Let the original height of objects A and b be h, the cross-sectional area of a be s a, and the cross-sectional area of b be sb; The density of a is ρA, and the density of b is ρ b;

According to p = fs = GS = rhoshgs = rhohg:

The pressure of A on the ground is pA=ρAhg, and the pressure of B on the ground is Pb = ρ bhg;

Pa > Pb, that is ρ ahg > ρ bhg,

∴ρA>ρB，

When the same mass m is cut from the upper parts of two objects in the horizontal direction,

mA=ρASA△hA，mB=ρBSB△hB，

MA = mB = m, and ρ a > ρA>ρB, sa > sb.

∴△hApb′.

So choose a.