Explanation

The correct answer is 'yes - these can be completed without warning which would give Ali an accurate picture of the supplier's operations'. The other options are incorrect:

1) you can do many types of audit- financial, ethical, Health and Safety etc

2) asking a supplier about their ethical practices isn't likely going to get you accurate information. They'll just tell you what they think you want to hear

3) audits are great- but they don't ALWAYS uncover issues. Always is the key word in that sentence which makes it incorrect.