Problem: three interviewers , a , b , and c are interviewing 40 applicants . only with three interviewers ' admission can an applicant be admitted . if interviewer b admitted 15 applicants , a admitted 17 applicants , and c admitted 20 applicants , at least how many applicants get the admission ? 
Options: ['a ) 8', 'b ) 2', 'c ) 6', 'd ) 0', 'e ) 12']
d