Statements
1. r || s
2. Mr = d-b/c-0=d-b/c
Ms=0-a/c-0=-a/c
3. distance from (0, b) to (0, a) equals the distance from (c,d) to (c, 0)
4.d-0=b-a
5. Mr = (b-a)-b/c
6. Mr = a/c
7. Mr = Ms

Reasons
1. Given
2. Application of the slope formula
3. Definition of parallel lines
4. Application of distance formula
5. Substitution property of equality
6. Inverse property of addition
7. Substitution property of equality

Which step contains an error?
A. Step 6
B. Step 4
C. Step 5
D. Step 2