Question: Which screenplay by Kenneth Ross  was directed by Fred Zinnemann?

Context paragraphs:
People on Sunday: People on Sunday (German: Menschen am Sonntag ) is a 1930 German silent drama film directed by Robert Siodmak and Edgar G. Ulmer from a screenplay by Billy Wilder.  The film follows the lives of a group of residents of Berlin on a summer's day during the interwar period.  Hailed as a work of genius, it is a pivotal film not only in the development of German cinema but also of Hollywood.  In addition to the directors and Wilder, the film features the talents of Curt Siodmak (story), Fred Zinnemann (cinematography) and Eugen Schüfftan, who had developed the Schüfftan process for "Metropolis" three years earlier.

Five Days One Summer: Five Days One Summer is a 1982 American drama film directed by Fred Zinnemann and starring Sean Connery.  It was the last film that Zinnemann directed.

Teresa (1951 film): Teresa is a 1951 American drama film directed by Fred Zinnemann and starring Pier Angeli and John Ericson.  The film's screenplay was written by Stewart Stern based on a story he wrote with Alfred Hayes, for which they were nominated for an Academy Award for Best Story.

Rod Steiger on screen and stage: Rod Steiger was an American actor who had an extensive career in film, television, and stage.  He made his stage debut in 1946 with Civic Repertory Theatre's production of the melodrama "Curse you, Jack Dalton!" .  Four years later, he played onstage in a production of "An Enemy of the People" at the Music Box Theatre.  A small role in Fred Zinnemann's "Teresa" (1951) marked his film debut.  In 1953, he played the title role in the teleplay "Marty" (two years before the film starring Ernest Borgnine) to critical praise.  His breakthrough role came with the crime drama "On the Waterfront" (1954), which earned him an Academy Award for Best Supporting Actor nomination, and subsequent appearance in Fred Zinnemann's musical "Oklahoma! ".

The Day of the Jackal (film): The Day of the Jackal is a 1973 Anglo-French political thriller film directed by Fred Zinnemann and starring Edward Fox and Michel Lonsdale.  Based on the 1971 novel "The Day of the Jackal" by Frederick Forsyth, the film is about a professional assassin known only as the "Jackal" who is hired to assassinate French president Charles de Gaulle in the summer of 1963.

High Noon: High Noon is a 1952 American Western film produced by Stanley Kramer from a screenplay by Carl Foreman, directed by Fred Zinnemann, and starring Gary Cooper.  The plot, depicted in real time, centers around a town marshal, torn between his sense of duty and love for his new bride, who must face a gang of killers alone.

Julia (1977 film): Julia is a 1977 American drama film directed by Fred Zinnemann, from a screenplay by Alvin Sargent.  It is based on a chapter from Lillian Hellman's book "Pentimento" about the author's relationship with a lifelong friend, "Julia," who fought against the Nazis in the years prior to World War II.  Hellman said the story was true, but critics have challenged its accuracy.  The film in DeLuxe Color was produced by Richard Roth, with Julien Derode as executive producer and Tom Pevsner as associate producer.

Black Sunday (1977 film): Black Sunday is a 1977 American thriller film directed by John Frankenheimer, based on Thomas Harris' novel of the same name.  The film was produced by Robert Evans, and stars Robert Shaw, Bruce Dern and Marthe Keller.  It was nominated for the Edgar Allan Poe Award for Best Motion Picture in 1978.  The screenplay was by Ernest Lehman, Kenneth Ross and Ivan Moffat.  Ross had previously written the screenplay for "The Day of the Jackal", a similar plot-driven political thriller.

The Old Man and the Sea (1958 film): The Old Man and the Sea is a 1958 American adventure drama film directed by John Sturges with uncredited direction from Henry King and Fred Zinnemann.  The screenplay (the "most literal, word-for-word rendition of a written story ever filmed") was adapted by Peter Viertel from the novella of the same name by Ernest Hemingway.

The Search (2014 film): The Search is a 2014 French drama film written, directed, produced and co-edited by Michel Hazanavicius and co-produced by Thomas Langmann.  The film is a reiteration of the Oscar-winning post-Holocaust drama also called "The Search", directed by Fred Zinnemann, in which a compassionate westerner helps a lost child find what is left of his family amidst the chaotic flood of post-war civilian refugees.  In the 1948 film, the backdrop is post-war Berlin; "The Search" (2014) takes place in the "front lines of the Russian invasion of Chechnya" during the first year of the Second Chechen War (1999-2009).  In both cases, international aid workers help the families reunite.  "The Search" was selected to compete for the Palme d'Or in the main competition section at the 2014 Cannes Film Festival.

Supporting paragraphs: Black Sunday (1977 film) The Day of the Jackal (film)
Answer: The Day of the Jackal