A)the energetically favorable movement of water across a semipermeable membrane,from an area with a high activity of water to an area with low activity of water. B)the energetically costly movement of water across a semipermeable membrane,from an area with a high activity of water to an area with low activity of water. C)the energetically favorable movement of solute across a semipermeable membrane from an area with a low activity of water to an area with high activity of water. D)the energetically favorable movement of water across a semipermeable membrane from an area with a low activity of water to an area with high activity of water.