Indicate which property is illustrated in Step 1.

Step 1 2 • 6 • 5 • 1 = (2 • 6) • (5 • 1)
Step 2 = (6 • 2) • (1 • 5)
Step 3 = 12 • (1 • 5)
Step 4 = 12 • 5
A.
associative property of multiplication
B.
commutative property of multiplication
C.
commutative property of addition
D.
associative property of addition