HELP PLS I FORGOT!! Megan argues that (5m-3)+(2m+4) models the closure property. What reasoning could Megan use to argue that addition of polynomials is closed? A.) The coefficients of the sum are whole numbers and the sum is a polynomial. B.) The coefficients of the product are integers and the product is a polynomial. C.) The exponents of the sum are whole numbers and the sum is a polynomial. D.) The exponents of the sum are integers and the sum is a polynomial. E.) The terms in the expression are rational numbers in the sum is a polynomial.