Which stakeholders are the focal point of all marketing activities?

CUSTOMERS

Explanation: In simple words, stakeholders refers to those individuals who gets affected by the operational activities of the business. Customers are also a stakeholders of the business.

Marketing activities refers to the decisions and policies that a company makes to promote its product in the market for the objective of earning higher profits.

And as we know that customer are the source of revenue for the business, we can conclude that customers is the right answer.

answer (b); /// a method of measuring the opinions of a large group of people by selecting a subset of the larger group, asking them a set of questions and then generalizing those responses;