Among the options provided, option b. increase restrictions on the importing of Japanese automobiles and electronics is least likely to increase growth in Africa.
Restricting imports can lead to higher prices for consumers, reduced competition, and potential retaliation from trade partners, which can negatively impact economic growth. The other options—investing in education, eliminating civil war, and reducing restrictions on foreign investment—are generally more likely to promote sustainable economic growth by improving the workforce, stabilizing the country, and attracting investment, respectively.