The correct options are
A Natural resources would have depleted even faster.
B Waste management would have been more difficult.
The adoption of the principle of the 3Rs has helped in a number of ways. Had this not been done, the world would likely have seen its natural resources deplete at a quicker rate. For instance, if paper was not reused and recycled, a larger number of trees might have been cut as a result. Furthermore, waste management would have been a more complex task given the sheer volume of waste that might have been generated in the absence of the 3Rs.