Consider the following statements 
(A) A gas filled balloon stops rising after it has attained a certain height in the sky. 
(B) At the highest point in the sky, the density of air is such that the buoyant force on the balloon just equal its weight. 
Select the correct option.
(a) (A) is false but (B) is true.
(b) Both (A) and (B) are true.
(c ) (A) is true but (B) is false.
(d) Both (A) and (B) are false.

• A

  Both (A) and (B) are true.

• B

  (A) is true but (B) is false.

• C

  (A) is false but (B) is true.

• D

  Both (A) and (B) are false.