For a rotameter, which one of the following statements is TRUE?

(A) The weight of the float is balanced by the buoyancy and the drag force acting on the float

(B) The velocity of the fluid remains constant for all positions of the float

(C) The measurement of volume flow rate of gas is not possible

(D) The volume flow rate is insensitive to changes in density of the fluid

(A) The weight of the float is balanced by the buoyancy and the drag force acting on the float

(B) The velocity of the fluid remains constant for all positions of the float

(C) The measurement of volume flow rate of gas is not possible

(D) The volume flow rate is insensitive to changes in density of the fluid