Final answer:
AC current in a refrigerator is more likely to interfere with compass readings than the DC current used when starting a car because AC current creates a fluctuating magnetic field, which can disturb the compass needle.
Step-by-step explanation:
The likelihood of interfering with compass readings is higher with AC current, like that in your refrigerator, compared to DC current when you start your car. This interference is due to the alternating nature of AC current, which creates a changing magnetic field. This fluctuating field can disturb the magnetic needle of a compass, causing it to give erroneous readings. In contrast, the DC current used to start a car produces a steady magnetic field which is less likely to cause significant compass disturbances, especially if the compass is not in close proximity to the car's electrical system.