Governments can cause the supply of a good to increase by

To increase a price the government will have to raise taxes.

If they lower taxes on the product then they will bring in less money. This will cause then to be even further behind.

If they create new regulations then it will only make it harder to sell the product

And if the government warns the company that it is dangerous it will be like telling people they need to wear a mask. Most people didn't do it until they were required to by law.

d. china

good luck

d is the best choice