A) Please, nobody fill out the survey more than once. To make it anonymous, there's no enforcement of single submission per person. Repeat submissions will reduce the quality of the data.
B) It's a common line of argument against modern business culture that says, "You can't have more than one top priority." By the same token, you can't have more than one thing that you are most interested in. That's the essence of the question — what is the pursuit that has you most passionate, most curious, most determined. If you need to choose more than 50% of the long list of choices, that's no longer speaking to the peak of your passion, and is instead speaking to the breadth. That's a separate question entirely, one which I sadly didn't think to ask in this survey (nor did anyone else who helped draft the survey in #meta — I'm taking you all under the bus with me!)
I don't want to revise the survey significantly now, because it would be unfair to all the folks who have already responded. However, I've learned that this is a very nuanced kind of question to ask, and so we should probably have further discussions about how to classify our interests and wrap some sort of quantifiable mesh around them in advance of the as-yet-hypothetical next year's survey.