Which method supplies the maximum amount of hydrogen gas?a.wastewater treatmentb.anaerobic digestionc.electrolysisd.natural gas

The method that supplies the maximum amount of hydrogen gas is electrolysis. Here's why:

a. Wastewater treatment: While this method can produce hydrogen gas, it's not the primary goal of the process. The main purpose is to remove harmful substances from water, making it safe to release back into the environment.

b. Anaerobic digestion: This process involves breaking down organic material in the absence of oxygen. While it does produce biogas, which contains a small amount of hydrogen, the primary gases produced are methane and carbon dioxide.

c. Electrolysis: This method involves passing an electric current through water to separate it into hydrogen and oxygen gases. This process can produce a large amount of hydrogen gas, especially if it's scaled up.

d. Natural gas: While natural gas does contain a significant amount of hydrogen, extracting it is a complex process that also produces a lot of carbon dioxide, a greenhouse gas.

So,