Stability decreases with higher center of mass height.

Steps:

• Identify that stability on a flat surface depends on the center of mass (G) position relative to the base of support.
• Recall that a higher G requires less tilt for the vertical line through G to fall outside the base, causing toppling.
• Note all objects have equal mass, so base width and G height are key factors.
• Compare G heights across options: B's G is highest above the table.

Why B is correct:

• B's elevated G creates greater torque when tilted, allowing toppling at smaller angles per the stability condition where G must remain over the base.

Why the others are wrong:

• A: Low G and wide base keep it stable under larger tilts.
• C: G is lower than B's, requiring more tilt to destabilize.
• D: Broad base supports G projection longer than B's narrow one.

Final answer: B