Pencils come in packages of 8. Erasers come in packages of 7. Philip wants to purchase the smallest number of pencils and erasers so that he will have exactly 1 eraser per pencil. How many packages of pencils and erasers should Philip buy? A. 8 packages of pencils and 7 packages of erasers. B. 8 packages of pencils and 9 packages of erasers. C. 7 packages of pencils and 8 packages of erasers. D. 6 packages of pencils and 7 packages of erasers.