Which of the following is NOT a collaborator of the costume designer?

For which of the following accomplishments is George Owen Squier known?

a) he composed an influential folksong about the dangers of the atomic bomb b) he broke racial barriers by founding a quartet containing both white and African-American musicians c) he founded the first professional association of Music Therapists in the United States d) he founded the Muzak Corporation and marketed the service commercially

Who were the authors of such musical theatre hits as Oklahoma!, South Pacific, and The Sound of Music?

A. Bernstein and Sondheim B. Gilbert and Sullivan C. Rodgers and Hammerstein D. Lerner and Lowe