What is the justification for step 4 in the solution process?
9/2b + 11 – 5/6b = + 2
Step 1: 22/6b + 11 = 6 + 2
Step 2: 8/3b + 11 = 2
Step 3: 8/3b = 9
Step 4: b = -27/8
A. The subtraction property of equality
B. The multiplication property of equality
C. Combining like terms
D. The addition property of equality