The ambiguity in daisy miller: a study is best represented by

daisy's questionable virtue
the role of gossip in the novel
the use of commonplace language
the use of natural settings

The ambiguity in Daisy Miller: A Study is best represented by the use of natural settings. So, here the right answer is Option D.

Explanation:

Henry James’s novel “Daisy Miller” talks about a girl named Daisy Miller whom  Winterbourne met abroad. The character Daisy has different traits. She is independent,  spirited but also shallow and not to forget an absolute flirt. She has no charm and wit but can  manipulate really well so that she stays as the centre of attraction.

The author uses various  natural settings to build this character ambiguously. This means that the character doesn’t  come up with any specific traits. It is not very clear whether Daisy is good or bad.  Winterbourne is also facing the same dilemma. It is up to the reader to interpret Daisy’s  actions and draw a conclusion about her personality.  

c. to depict the cunningness of the federal soldiers