I thought I found the trick and it was that a space was missing. The lack of the space actually had nothing to do with the error but I thought it did so I selected the error message I thought would have been generated and got it right but for the wrong reason.
I'll admit that I expected the missing space to be the issue too, when I saw the question in the daily mail. But when I went to the sit, saw the answer options, and missed any option that I could relate to this missing space issue, I realized that apparently either the missing space is not a problem, or the author accidentally forgot the space and didn't realize. So I answered the question, then copied and executed the code to check that indeed, no space is required here.
Hugo Kornelis, SQL Server/Data Platform MVP (2006-2016)
Visit my SQL Server blog: http://sqlblog.com/blogs/hugo_kornelis