Select the correct statement about the membrane transport -

(A). Channel proteins form open pores, through which suitably sized molecules/ions can cross the membrane.

(B). Carrier proteins selectively bind specific molecules, and transport them across the membrane by undergoing a conformation change.

(C). Transport of molecules across membranes, through channel proteins and carrier proteins, always involves active transport.

(D). Small uncharged molecules can diffuse freely, through the phospholipid bilayers.

Choose the correct answer from the options given below: