Edith Wharton is the writer that portrayed upper-class Americans in his or her novels. The correct option in regards to all the options given in the question is option "c". The novel in which she portrayed the upper-class Americans was "The Age of Innocence".
Edith Wharton was born on 24th January 1862 and
died on 11th of August 1937. Edith Wharton was the famous Pulitzer Prize
winning American novelist, short story writer and a great designer. She also
got the nomination for the Nobel Prize in Literature in the years 1927, 1928
and 1930.