Which of the following items may cause false alarms with CO detectors?

Choosing "all of the above" is correct because each of the items listed has the potential to interfere with the operation of carbon monoxide (CO) detectors and trigger false alarms.

Cleaning solvents often contain volatile organic compounds that can produce harmful fumes, potentially confusing the sensor of a CO detector. Similarly, floor wax might emit fumes when applied, which could mimic the presence of carbon monoxide, leading to unwanted alerts. Hair spray also releases aerosols and chemicals that may register on these detectors, causing them to react as if there were dangerous levels of CO present.

Given that all three items share characteristics that could simulate CO readings, it's important for users of CO detectors to understand how various household products can lead to false alarms, ensuring proper maintenance and situational awareness of their environment.