Concept:The expression "put out with" means to endure or tolerate something unpleasant.Explanation:"Put out with" is used in the sense of "put up with", which means to bear or accept someone's irritating behaviour patiently.Her attitude is unpleasant, and he finds it hard to bear it.Therefore, the most appropriate interpretation is that he finds it difficult to tolerate her behaviour.Answer:A. tolerate her behaviour