A balloon filled with Helium gas cannot continue to rise indefinitely. This happens because

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Size of the balloon gradually decreases, hence, buoyant forces decreases

Size of balloon increases, hence, buoyant forces increases

Weight of the gas filled balloon gradually decreases

Density of air decreases, hence, buoyant forces decreases

answer is D.

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Detailed Solution

As the balloon rises, density and pressure of air decrease. As a result volume of the balloon increases. Buoyant force $B = ρ V g$ . Effect of decrease in density dominates over the effect of increase in volume. Hence buoyant force decreases and the balloon stops rising further.

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