Task: Question Answering
Input (English): Problem: there are 300 seniors at morse high school , and 50 % of them have cars . of the remaining grades ( freshmen , sophomores , and juniors ) , only 10 % of them have cars . if 20 % of all the students at morse have cars , how many students are in the 3 lower grades ? 
Options: a ) 600 , b ) 900 , c ) 1200 , d ) 1350 , e ) 1500
Output (English): b