Answer: C) Continuously improve their products at home.
Step-by-step explanation:
Protectionism policies like tariffs and import quotas have the effect of reducing free trade which erodes consumer welfare as well as hurting trade so should be avoided if better options exist.
One of those is for a company to increase its market base instead of relying on protection from the government. If they can expand into foreign market, they will have a larger market in which to trade their goods and increase profitability.
Another way is to improve their products at home. Better products would attract more customers to their products and increase profitability.