Boy, how do I hate questions like this. No wait, the question is okay, it's the answer options.
If the question is "how many rows", the answer options should be numbers. All of them. Otherwise, you run the risk of having multiple correct options.
As happens here. Because of the showplan option, the statement will be compiled and not executed. That is one of the options (though technically not an answer to the question).
The result of that compilation will then be returned in XML form. That XML is embedded in a result set that has a single column and a single row. So the correct answer is also one. Sheesh!
Given my utter lack of mindreading skills, I flipped a coin. And I got lucky this time, so I picked the correct answer. Which is a good thing - I expect to see a lot of responses from people demanding their point, so now I have one to give away to them - last time I tried, the local supermarket didn't accept them as payment, so I don't really need them anyway.
This (badly formulated answers making multiple options correct) has happened too often recently. (No I have no statistics, this comment is based on gut feeling). Question authors, I really appreciate all you do - but before submitting, please take a minute to review the question, and checkk to make sure there is no confusion possible. (And while you're at it, how about copy/popaste the code to a server with a case sensitive collation and a locale setting other then the one you normally use to check if it runs there as well - not an issue with today's question, but I'm in a rant anyway so I'll just spill all).
Okay, rant is out. Malls, thanks for your question. Despite its flaws, it is an informative question and I'm sure there will be people learning from it.