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

Input: Consider Input: Problem: if the ratio of two number is 5 : 7 and lcm of the number is 320 then what is the number . 
Options: a ) 15 , b ) 9 , c ) 10 , d ) 11 , e ) 35

Output: b


Input: Consider Input: Problem: a can contains a mixture of liquids a and b is the ratio 7 : 5 . when 9 litres of mixture are drawn off and the can is filled with b , the ratio of a and b becomes 7 : 9 . how many liter e of liquid a was contained by the can initially ? 
Options: a ) 10 , b ) 20 , c ) 21 , d ) 25 , e ) 27

Output: c


Input: Consider Input: Problem: the h . c . f . of two numbers is 23 and the other two factors of their l . c . m . are 13 and 17 . the larger of the two numbers is : 
Options: a ) 276 , b ) 299 , c ) 391 , d ) 345 , e ) 355


Output: c