Question

to help encourage economic growth, a country can
stop selling goods to other countries.
invest in research and development.
lay off unneeded workers.
lower requirements for education.

Explanation:

Investing in research and development can lead to new technologies, products, and services, which can drive economic growth. Stopping exports limits market access, laying - off workers can cause social and economic instability in the short - term, and lowering education requirements may reduce the quality of the future workforce.

Answer:

B. invest in research and development