Explanation:

Steam-methane reforming is currently the least expensive way to produce hydrogen, and it accounts for nearly all commercially produced hydrogen in the United States.
Other methods of producing hydrogen

• Research is underway to develop other ways to produce hydrogen, such as
• Using microbes that use light to make hydrogen
• Converting biomass into gas or liquids and separating the hydrogen
• Using solar energy technologies to split hydrogen from water molecules.

Hence option 3rd is correct.