Task: Question Answering
Input (English): Problem: a recipe requires 2 1 / 2 ( mixed number ) cups of flour 2 3 / 4 ( mixed number ) cups of sugar and 1 1 / 3 ( mixed number ) cups of milk to make one cake . victor has 15 cups if flour , 16 cups of sugar and 8 cups of milk . what is the greatest number of cakes william can make using this recipe ? 
Options: a ) 5 , b ) 6 , c ) 7 , d ) 8 , e ) 9
Output (English): a