Please consider the following list:
1. Option A, B, or C:
The writer of the list contends that A and B (together) or C are the choices. I believe that, the way it is written, A or B or C are the choices. Please offer your input. Thanks.
I agree with you. If [A and B] is one option, I think it would have to be phrased "the options are either A plus B or C"