Answer:
D. $3 million or more
Step-by-step explanation:
The International Auditing Standards comments that it is advised in auditing that when there are multiple materialities in an audit, using an average of the materialities will lead to an amount that will be too large for the lower materiality that has been set.
Therefore in the case of this scenario, $6.5 cannot be used because it will be too large for the income statement amounts, hence the advised level is the lower materiality of $3 million.