Answer:
The correct answer would be a. it is continually replenished.
Renewable resources are those which are available in unlimited quantity in an ecosystem.
The pace of replenishment of these resources is similar to the pace of their consumption.
For example, solar energy, hydro-energy, geothermal energy et cetera.
These resources help us in achieving sustainability, reduce pollution, reduce our dependency on fossil fuels, prevent drastic climatic changes et cetera.
So, we can say that solar energy is a renewable resource because it is continually replenished
