Answer:
Option B. Step 2
Explanation:
we have
----> equation A
----> equation B
step 1
Multiply equation A by -2 both sides
step 2
Simplify equation A
-----> equation A
The first error is in step 2
The student's mistake was to multiply equation A by -2 on the left side only and not on both sides.
step 3
Adds equation A and equation B

The system has no solution
The lines are parallel