Pressure equals density times gravity times height

Steps:

• Convert height to meters: h = 80 cm = 0.8 m
• Use formula for pressure from weight: P = ρ g h, with g = 10 m/s²
• Rearrange to solve for density: ρ = P / (g h)
• Substitute values: ρ = 1500 / (10 × 0.8) = 1900 kg m^{-3}

Why B is correct:

• From definition, pressure P on surface = weight/area = ρ g h, so ρ = P/(g h) = 1900 kg m^{-3}

Why the others are wrong:

• A is 10 times too small, underestimating density
• C is 10 times too large, overestimating density
• D is 100 times too large, far exceeding typical metal densities

Final answer: B