A rectangular lamina of width b and depth d is submerged vertically in water, such that theupper edge of the lamina is at a depth h from the free surface. What will be the expression for the depth of the centre of pressure?

• A. (h + frac{d}{3} frac{2h+d}{3h+2d} )
• B. (h + frac{d}{6} frac{3h+2d}{h+2d} )
• C. (h + frac{d}{3} frac{3h+2d}{2h+d} )
• D. (h + frac{d}{3} frac{3h+2d}{h+d} )