Final answer:
Auditors are primarily concerned with the risk of assessing control risk too low in performing tests of controls.
Step-by-step explanation:
In performing tests of controls, auditors are primarily concerned with the risk of assessing control risk too low. Control risk refers to the risk that a material misstatement could occur in the financial statements and not be detected by the entity's internal controls. If auditors assess control risk too low, they may rely too heavily on the entity's controls and not perform enough substantive testing to detect potential misstatements.