In a high school with 500 students, 40 \% of the seniors play a musical instrument, while 30 \% of the non-seniors do not play a musical instrument. In all, 46.8 \% of the students do not play a musical instrument. How many non-seniors play a musical instrument?
Answer Choices
A. 66
B. 154
C. 186
D. 220
E. 266