Answer:
A) Using the same glass each time you get water from your sink.
Step-by-step explanation:
Option B) is wasteful, as you do not need a brand new cup every time you refill your glass. And while paper will decompose, it is still harmful for the environment to cut down trees needed to make them, and produce those paper cups.
Option C) is harmful as well. If you were to refill a singular steel bottle, that would be much better, but the option says buy a new one each time you need water. This creates more waste that will end up in the landfills in the long run.
Option D) has a harmful impact on the environment because of the large amount of plastic waste it creates. Using a plastic bottle each time you are thirsty creates a large amount of plastic waste. Plastic requires many many years to fully decompose, and production is bad for the environment.
This is why option A) has the least harmful impact on the environment. Option A) says using the same glass each time you need water, which reduces the amount of waste created.