Answer:
I believe the answer is of option 5.
When you go to a shop or office and you ask for the manger for help or for a complaint etc that is in person customer service as you’re in person to receive the customer service.
Answer:
Hydrogen could become a future energy source as it can be used to create steam, electricity and other forms of energy. Hydrogen is also considered a clean form of energy, as its only product is water, which is harmless.
Explanation:
