Read the following excerpt carefully.

In the future, hydrogen may form a significant part of our energy systems. Today it is mostly used in oil refineries and fertiliser but in the future hydrogen could power our cars, heat our homes, and fuel industry. A recent McKinsey study suggested that in less than 25 years, hydrogen could account for 18% of global energy consumption and reduce carbon dioxide emissions from current levels by some 6 gigatons….

Which of the following sentences will MOST logically complete the above excerpt?

The impact of such a change in the energy system would be huge, potentially generating $2,500 billion in revenue globally and creating more than 30 million jobs.

Germany unsuccessfully experimented with trains fuelled by hydrogen.

Hydrogen can be made through reformation, electrolysis, or pyrolysis, comes labelled in different colours from simple green to more complicated turquoise, can be stored as a gas, cryogenic liquid, converted to ammonia or even borane and then finally made useful through a fuel cell, engine, or burner.

Despite the potential, 90% of the general population knew nothing about hydrogen technology.

Earlier, experts thought that hydrogen fuel would be too expensive