Task: Question Answering
Input (English): Problem: the edges of three metal cubes are 1 cm , 2 cm , and 3 cm respectively . a new cube is made by melting these three cubes together . what is the edge of the new cube ( in centimeters ) ? 
Options: a ) 3.3 , b ) 3.5 , c ) 3.7 , d ) 3.9 , e ) 4.1
Output (English): a