Music class is often seen as a fun extracurricular activity. Generally, individuals that study music achieve more exceptional scores in subjects such as math and language arts. However, music programs in schools are often underfunded or are given less attention than the typical academic subjects. Which of the following is an underlying assumption of the argument above?

a. Music needs to be introduced at an early age for the benefits to be fully realized.
b. Learning to play an instrument can be fun but expensive.
c. Individuals who study music tend to be more intelligent.