Where do I place 'only' [duplicate]
Solution 1:
All are okay.
Following the analysis of "only" in McCawley's The Syntactic Phenomena of English, the focus of "only" in your examples is "two". The placement rule is: "only" is attached to a constituent (other than S) containing its focus. The structure of your example A is:
[I [only [VP answered [NP two questions ] ] ] ]
so it satisfies the rule.