The correct answer is: Operational audit
Rationale: A systems audit is based on the testing and evaluation of internal controls. A probity (or transaction) audit checks account entries to identify errors or omissions which may indicate fraud. A social audit measures the social responsibility or social impacts of the business.
Pitfalls: This is another area of distinctive clusters of terminology: make sure you can identify operational, systems and transactions audits - and the types of tests they use (compliance v substantive).
