What is a good instrument for a college voice student to take?

Piano, cello, xylophone, harp, accordion, electronic organ, classical guitar. The reason why I didn't choose the violin for you is because the way it is played, it has an effect on your image, and it is easy to practice your neck crookedly by clamping the violin for a long time (because of habit). The wind instrument was also not chosen because it will affect your vocalization and will not be good for your vocal path.