In this task, you need to provide the correct option for a given problem from the provided options.

Ex Input:
Problem: at the faculty of aerospace engineering , 312 students study random - processing methods , 232 students study scramjet rocket engines and 112 students study them both . if every student in the faculty has to study one of the two subjects , how many students are there in the faculty of aerospace engineering ? 
Options: a ) 424 . , b ) 428 . , c ) 430 . , d ) 432 . , e ) 436

Ex Output:
d


Ex Input:
Problem: find the fraction which has the same ratio to 2 / 13 that 5 / 34 has to 7 / 48 ? 
Options: a ) 240 / 1576 , b ) 240 / 1542 , c ) 240 / 1547 , d ) 240 / 1528 , e ) 240 / 1529

Ex Output:
c


Ex Input:
Problem: the h . c . f . of two numbers is 18 and the other two factors of their l . c . m . are 11 and 15 . the larger of the two numbers is : 
Options: a ) 270 , b ) 300 , c ) 299 , d ) 322 , e ) 345

Ex Output:

a