**What is the justification for step 3 in the solution process? **

**0.8a − 0.1a = a − 2.5 **

**Step 1: 0.7a = a − 2.5 **

**Step 2: -0.3a = -2.5 **

**Step 3: a = 8.3 **

A. the addition property of equality

B. the subtraction property of equality

C. the division property of equality

D. combining like terms