I consider B wrong. No real difference between A and C.
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seagullLongman Dictionary of Contemporary English (5th Edition), which I trust most, says: Do not say 'recommend (someone) to do something'. Say recommend doing something or recommend that someone (should) do something. What do you think?I think that's good advice (even if it is not universally followed). B sounds horrible to my ear unless you omit "to", but