True of False Hot Springs and Geysers indicate there is hot
rock, magma, underneath heating the water.

The statement is true.

Explanation:

Hot springs and geysers are natural features where we have warm to hot water coming out or propelling into the air. They can be found in a lot of places around the world, but what can be noticed is that the highest concentration of them is actually near the plate boundaries, slightly less in former volcanic areas, and rarely in areas that have not been tectonically active for a prolonged period of time.

The reason for such distribution is that the magma deep into the crust and the hot rocks are what cause the formation of hot springs and geysers. The groundwater gets heated by the magma that has managed to rich to a certain point in the crust, or has heated up the rocks above it. Being exposed to heat, the water gets hot as well, but also that creates a lot of pressure, and in the case of the geysers it results in shooting out hot water high into the air.

a and b because with the other three, they simplify to something else.