It would be D. Subjective.
Answer: Differentiation
Explanation:
The differentiation is the process in which we generally used to differentiate between the product and the services as compared to other in the marketing.
In the marketing industry, we usually used the differentiation for differentiate the our organization product as compared to the competitor's product and services.
The product differentiation of product is one of the mist important factor for the financial climate.
You need a variable. If something happens once it could just be chance. Like if you got a lottery ticket and won, it would just be chance. Not the thing that happens the most.