What Is an "Encompassing Coalition" in Regard to Overcoming Collective

What is an "encompassing coalition" in regard to overcoming collective action problems?

A) When less developed countries are surrounded by developing countries
B) An alliance consisting of enough domestic groups that it pursues broad social welfare
C) An alliance of foreign investors who can force less developed countries to make economic concessions
D) A union of less developed countries that can force developed countries to implement fairer trade policies