Task: Question Answering
Input (English): Problem: the average age of applicants for a new job is 30 , with a standard deviation of 7 . the hiring manager is only willing to accept applications whose age is within one standard deviation of the average age . what is the maximum number of different ages of the applicants ? 
Options: a ) 8 , b ) 14 , c ) 15 , d ) 18 , e ) 30
Output (English): c