Defining the problem is among the most difficult aspects of the marketing research process because of the of every situation a manager may encounter.

Uniqueness

Explanation:

Defining the problem is among the most difficult aspects of the marketing research process because of the uniqueness of every situation a manager may encounter. Marketing research helps us in identifying different new solutions for the customers but the problem which Marketing manager encounters is the uniqueness and contextual nature of every situation, dilemma and problem they face. Managers have to deal each and every situation differently purely on its context. Therefore, it is also said in marketing that the solutions found by KFC can't be used by the McDonald's for its customers.

a)Demand and supply

Explanation:

The opportunity cost of a choice is the value of the best alternative given up. Scarcity is the condition of not being able to have all of the goods and services one wants. It exists because human wants for goods and services exceed the quantity of goods and services that can be produced using all available resources.