Final answer:
Benny Carter was a renowned composer, arranger, bandleader, and alto saxophonist in jazz, but not primarily known as a trumpeter.
Step-by-step explanation:
Benny Carter was a multifaceted figure in the world of jazz music. Although he was indeed an accomplished and influential composer and arranger, a bandleader, and an exceptional alto saxophonist, Benny Carter was not known for playing the trumpet. His contributions to jazz were significant in a variety of roles, but his primary instruments were the alto saxophone and later, the trumpet, which he picked up after his initial successes. Therefore, the statement that he was important as a trumpeter does not correctly represent his early role in jazz.