2019 AMC 8/ Problem 18  The faces of each of two fair dice are numbered 1, 2, 3, 5, 7 and 8. When the two dice are tossed, what is the probability that their sum will be an even number? 
选项为:A:$\dfrac{4}{9}$  B:$\dfrac{1}{2}$  C:$\dfrac{5}{9}$  D:$\dfrac{3}{5}$  E:$\dfrac{2}{3}$  请回答其中一个选项.