1-C. His acting was far from unacceptable.His acting was far from unacceptable.
彼の演技は、遠かったです、許容できないからダヨ。(=許容できる)
2-C. For example, people in a culture might share beliefs about the kinds of foods that are unacceptable.For example, people in a culture might share beliefs about the kinds of foods that are unacceptable.