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What is one main objective in the study of economics?

recognizing the types of services available to everyone
recognizing the relationship between producers and consumers
recognizing the reasons why consumers supply services
recognizing the difference between producers and consumers

One main objective in the study of economics is recognizing the types of services available to everyone.

Explanation:

Economics is the doctrine of how individuals, agencies, governing bodies and other organizations in society make choices, and how these choices determine how their resources are spent by society. If there are more people who want a resource than there are people who can get it, one must in some way or other distribute the scarce resource. Economics tries to provide a theoretical framework to handle these problems.

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the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.