Which problem demonstrates the associative property of multiplication?

(5.2 • 3.1) • 1.9 = 5.2 • (3.1 • 1.9)
5.2 (3.1 + 1.9) = (5.2 • 3.1) + (5.2 • 1.9)
(5.2 + 3.1) + 1.9 = 5.2 + (3.1 + 1.9)
5.2 + 1.9 + 3.1 = 10.2
I NEED THIS ASAP BECAUSE ITS PAST DUE