Task: Question Answering
Input (English): Problem: of 30 applicants for a job , 16 had at least 4 years ' experience , 21 had degrees , and 5 had less than 4 years ' experience and did not have a degree . how many of the applicants had at least 4 years ' experience and a degree ? 
Options: a ) 12 , b ) 10 , c ) 9 , d ) 7 , e ) 5
Output (English): a