I did as well. But when I did so, I heard it a little like an expression of surprise or exasperation. It certainly does not necessarily mean that in English, but it is an unusual construction to use instead of who is arriving or who will arrive. I suppose if you are marking people on your calendar based on what month you arrive and are going month by month it would make sense.
Sort of. The Italian present progressive is not used nearly as frequently as we do in English, so the Italian present tense can usually be translated as either the present or the progressive. But the issue is what is the difference in English. In English, except for stative verbs, we only use the present tense for general statements or for narration. This is a question, so it isn't narration. So the issue is who would actually ask who arrives in March as a general question. That is why I heard it as a surprised and disapproving question. It sounded like a version of "Who does that!". But my answer was accepted as it must be because it was technically correct. There are a few situations where someone might use the present tense for the immediate future as here, but they are fairly limited. And when translating real life situations, only one option would be the correct one. And in this case, Duo's answer would be applicable to most situations, the other only to a few.
Previously, I have been marked wrong for using present continuous, when the word is a simple present tense. My present tense was accepted here, but when is it permissible and when is it wrong? I accept the comments in this discussion, but I have still been marked wrong for eg. "we are going" which has to be "we go".
Who arrives in March? Would an acceptable answer to this question be, "The Spring" - a personification of the spring? In the English language we consider winter a person named Jack Frost. Do Italian people also consider seasons to be people, or would they ask "What arrives in March?" to get the answer "Spring arrives in March."
While we're on this topic, does Spring start in March in Italy? Here in New York it really varies. Sometimes it arrives in March, leaves, and comes back in May, and other years it arrives in April.