At the grocery store, Tina counts eight cartons with 6 eggs each, forty cartons with 12 eggs each, and twenty cartons with 18 eggs each. Which expression represents the problem?

(8 x 6) + (40 x 12) + (20 x 18)
(8 + 6) x (40 + 12) x (20 + 18)
(68 + 6) x (68 + 12) x (68 + 18)
(68 x 6) + (68 x 12) + (68 x 18)