Given the scenario where the rock is very hard, the company should use a percussion drill to effectively break up the rock. Since the groundwater is not too far below the surface, a suction pump would be suitable for bringing the water to the surface.
From the options provided, the most appropriate choice is:
a percussion drill with a suction pump.
However, since this option is not explicitly listed, the closest match would be:
a percussion drill with a submersible pump.
The submersible pump can still effectively lift the water from the well since the groundwater is not too deep, and it complements the use of a percussion drill in breaking the rock.