which one of the following ways can countries improve their gross national income

foreign investments

increase imports

sending people out of the country to get jobs

block international trade

Countries can improve their Gross National Income (GNI) through foreign investments and by increasing exports, rather than imports. Both of these options contribute to the growth of the country's economy. Sending people out of the country to get jobs might result in remittances, which can boost GNI, but it is not a sustainable long-term solution. Blocking international trade would have a negative impact on GNI as it would hinder economic growth and limit opportunities for revenue generation.