Eli is making soup for his family. He adds 3 cups of vegetables, 4 cups of broth, 1 cup of chicken, and 2 cups of noodles to the soup. What percent of the soup is vegetables?

A 33%
B 300%
C 30%
D 3%

The total amount of soup would be 3 + 4 + 1 + 2 = <<3+4+1+2=10>>10 cups.

The percent of the soup that is vegetables would be (3/10) * 100% = 30%.
Therefore, the answer is C) 30%.