The correct answer to the question is option a - They are not extensively industrialized.
OPEC is a group of oil-exporting nations that seek to maximize profits from oil exports. While they have some level of industrialization, particularly in the oil sector, they are not extensively industrialized in other areas and remain economically interdependent with industrialized nations.
The Organization of Petroleum Exporting Countries (OPEC) is formed by oil-exporting nations to maximize profits related to oil exports and collectively regulate the global oil market. Most OPEC members are indeed industrialized to a degree, as the extraction and exportation of oil require substantial infrastructure.
However, although petroleum exports represent a significant part of their economies, most of these countries are not heavily industrialized in other sectors.
The majority of countries in OPEC do have connections with industrialized countries, whether through trade, political alliances, or economic agreements and certainly do not aim to stop industrialized countries from buying oil. Their economies are often closely tied to the demand for oil from industrialized nations.
Therefore, the assertion that OPEC countries are economically independent of industrialized countries is inaccurate; they are economically interdependent on a global scale.