Dependency or underdevelopment theory is thought to be derived from neo-Marxism which means that: A. All of the above B. Developing countries should break trade ties with the developed countries and adopt socialist measures C. Rather than benefiting the developing country concerned, the benefits of trade with the developed world were more often felt in the metropolitan country and did not 'trickle down' to those most in need D. LDCs are not 'developing' but are underdeveloped primarily as a result of exploitation by the developed world