Task: Question Answering
Input (English): Problem: last year , for every 100 million vehicles that traveled on a certain highway , 75 vehicles were involved in accidents . if 6 billion vehicles traveled on the highway last year , how many of those vehicles were involved in accidents ? ( 1 billion = 1,000 , 000,000 ) 
Options: a ) 2500 , b ) 4500 , c ) 3500 , d ) 4000 , e ) 1300
Output (English): b