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

To help encourage economic growth, a country can  invest in research and development.

The investment of capital in research and development would lead the country to develope new innovations or improvement in existing product.

Consequently, the country's exports would increase due to the high quality or exclusivity of its product and help boost economic growth.  

Economic growth is an increase in the capacity of an economy to produce goods and services, compared from one period of time to another.

To help encourage economic growth, a country can  invest in research and development.

Economic growth refers to the increase in real GDP of a country that simply implies increase in output, income and expenditure of the country.

Economic growth supports higher standards of living, more investments in education and healthcare and more consumption.

To encourage economic growth, country can take following steps:

By advancing the technological aspect, a country can increase its production and hence can encourage economic growth. Therefore, investing in research and development can encourage economic growth.

Hence, the correct option is B.

Learn more about the economic growth here:

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increase in population