Final answer:
The answer is b. standards within a system of quality control. Accounting firms follow these standards to provide professional services that conform to professional standards.
Step-by-step explanation:
The answer to the question is b. standards within a system of quality control. Following standards within a system of quality control helps accounting firms achieve their objective of providing professional services that conform to professional standards.
Globally, accounting firms have established quality control procedures that ensure compliance with professional standards. These procedures include quality reviews, adherence to ethical codes, and ongoing training and development for staff members.
For example, in the United States, accounting firms follow the quality control standards issued by the Public Company Accounting Oversight Board (PCAOB). These standards help ensure that audit work is performed with due professional care and that the firm maintains an appropriate system of quality control.