(A) Air exerts an upward force on the balloon.
(B) The balloon is weightless.
(C) Helium is less dense than air.
(D) Helium pushes down on the air below the ballon.
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(A) Air exerts an upward force on the balloon.
(B) The balloon is weightless.
(C) Helium is less dense than air.
(D) Helium pushes down on the air below the ballon.