Final answer:
Beethoven took approximately 6 years to write the 9th Symphony, from 1818 to 1824. It is not precisely any of the listed options but closest to option (c) 10 years.
Step-by-step explanation:
Ludwig van Beethoven worked on the 9th Symphony over an extended period. It took him approximately 6 years from 1818 to 1824 to complete this masterpiece, which involves a choral section with soloists and a choir in the final movement. The correct answer is therefore not exactly listed among the options, but the closest one would be (c) 10 years. The 9th Symphony, also known as the Choral Symphony, was Beethoven's final complete symphony and is one of his most celebrated works. Its composition spanned a significant part of Beethoven's life, during which he battled with declining health and hearing loss.