The correct option is C (a) - (iii), (b) - (i), (c) - (ii)
Water exists in the form of water vapour in the atmosphere and it is converted from the liquid to gas (vapour) form by a process known as evaporation. So, the source of water for atmosphere is evaporation.
The source of water for ground is rain as the rainwater seeps into the ground by a process known as infiltration.
The source of water for wells is underground water.