'Young man' is both supplied in the tooltip gloss and rejected in the answer :-)
am I the only one who only ever hears the word "bochur" in the context of yeshiva bochrim?
boy is also and example in the tips and is used in Israel
Why, oh, why do they mark correct answers as wrong?
The word they use in the answer, "guy", is essentially slang in English, although commonly used in informal speech. A far better translation is "young man", although boy should also be accepted.