Final answer:
William Grant Still was a versatile composer who wrote a. film and television scores, operas, and symphonies, encompassing all listed genres.
Step-by-step explanation:
William Grant Still was a prolific American composer who wrote in a variety of genres. The correct choice is d. all possible answers. Still composed for film and television scores, he wrote operas, and he also composed symphonies along with other orchestral works. His versatility and talent allowed him to excel in all these forms, making a significant contribution to American classical music and breaking barriers as an African American composer.