Given the task definition and input, reply with output. In this task, you need to provide the correct option for a given problem from the provided options.

Problem: the concentration of spirit in 3 different vessels a , b and c are 45 % , 30 % and 10 % respectively . if 4 litres from vessel a , 5 litres from vessel b and 6 litres from vessel c are mixed , find the concentration of spirit in the resultant solution .
Options: a ) 26 % , b ) 33 % , c ) 34 % , d ) 35 % , e ) 24 %
a