Each batch of cupcakes lena makes uses 3 cups of flour, 1 cup of milk, and 2 cups of sugar. lena wants to make 5 batches of cupcakes. which expression represents how many cups of flour, milk, and sugar will she need in all? * a 5 x (3 + 1 + 2) b 5 x 3 + (1 + 2) c 5 x (3 + 1) + 2 d (5 x 3) + 1 + 2