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Right, so to which sentence is "За какой срок можно научить ребенка кататься на коньках?" closer in meaning?[/quote]

How long does it take...

За какой срок можно (кому угодно) научить ребенка...

Насколько быстро вы сможете научить ребёнка кататься на коньках?

This is a concrete question. It asks how quickly could you (personally) teach a (maybe even the) child to skate.



Сколько...

I think "could" is more appropriate for the translation, since the original sentence contains "можно".[/quote]

I agree with chaika.

The most common (and correct) answer is B while A can be used too.

С is applicable only if the kid doesn't like skating but you want him to skate anyway.