The pcaob has the power to
a. inspect large firms annually.
b. issue quality control, ethics, and accounting standards.
c. demand the personal financial statements of audit staff.
d. review only audit engagements of registered firms.

A. inspect large firms annually

Explanation:

According to my research on Accounting Firms, I can say that based on the information provided within the question the PCAOB has the power to inspect large firms annually. The Public Company Accounting Oversight Board is in charge of overseeing the audits of public companies as well as other issuers.

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