“These poll differences are too great, 11 points, to be an issue of sampling error.”
An error of any size can theoretically come from sampling error. Because you are measuring a sample rather than the population, your measure[mean, proportion, etc.] is very likely to differ from the actual measure. If you have drawn your sample correctly large deviations from the true population value occur with small probability, but they can still occur.
What you go on to say is that one pollster failed to list the correct responses in your opinion. It then is not surprising to get different results as a result of giving different samples a different set of answers to choose from.
Not in my opinion... it’s a matter of fact. You have no other choices besides Rossi and Murray. Suggesting there were other options misled the respondants.