(Not a native speaker) This sentence structure is exactly the same as the one we had earlier in Food Skill: Что нам приготовить на обед? (What should we make for lunch?/What do we make for lunch?)
(Мне надо/нужно выбрать что-то ... I need to choose something.
Нам надо/нужно приготовить что-то на обед. We need to prepare something for lunch.)
And in the question form, we omit надо/нужно.
The user who goes by the name of "Kapos' stated: 'A similar construction in English: "What to choose", or, literally, "What [is there] for me to choose?" The form itself implies "should".'... If this is correct then, 'What shall I choose?' ought to be accepted also... I don't know. What do you think?!
I think "What should I choose" would be better. Your suggestion sounds to me rather like a question about what will happen in the future. See https://en.wikipedia.org/wiki/Shall_and_will for some background. However, I believe any reasonable English translation that shows understanding of the intent of the Russian should be accepted, so if you believe yours is equivalent to the suggested translation, you should report it.
BTW, DL does not do generalized natural language understanding; it just has pattern-matching rules for acceptable answers. I think they should have a FAQ; it would avoid a lot of pique from us (users). My understanding is that the goal is not to necessarily give exhaustive coverage of possible translations (the moderators are volunteers and it can be labor-intensive), but instead to cover what perhaps 99% or so of users would answer, so as not to trip people up.
Thank you AndroidKanadaPLUS! I really appreciate your answer and you have made a very good point. I apologise if I sounded piqued! :D It was poor wording perhaps. I was definitely intending to ask a genuine question and not make a snotty statement (I realise it sounded so!) I did not know the moderators were volunteers and I must say that endears me even further to this site which I already love!