A Group of College DJs Surveyed Students to Find Out

A group of college DJs surveyed students to find out what music to plan for their upcoming parties. Thirty percent of the students preferred dubstep, 25% of the students liked trance music, and 20% wanted to hear only house music. Fifteen percent of the respondents selected both dubstep and trance. The proportion of students that like neither trance music nor dubstep is:

A) 0%.
B) 20%.
C) 40%.
D) 60%.