Task: Question Answering
Input (English): Problem: a group of boy scouts and girls scouts is going on a rafting trip . 70 % of the scouts arrived with signed permission slips . if 60 % of the scouts were boy scouts and 75 % of the boy scouts arrived with signed permission slips , then what percentage of the girl scouts arrived with signed permission slips ? round to the nearest percent . 
Options: a ) 50 % , b ) 60 % , c ) 63 % , d ) 66 % , e ) 70 %
Output (English): c