The answer to this is A. The use of this type of method can help reduce the number of carbon emissions that are released to the environment. A lot of times, this is the method that is most effective and most efficient too. It is not a surprise that a lot of industries are starting to use this especially if they want to show that they are being more sustainable as compared to before.
A lot of companies have contributed to the pollution that people are experiencing now. The fact that major companies are making some changes means a lot to the world and to the future generation.