Jason uses the following steps to construct a perpendicular through a point C on a line segment.

Step 1: From point C, draw an arc intersecting the line segment in points A and B.
Step 2: Draw two arcs from point A, one above and the other below the line segment.
Step 3: Using slightly more compass width, draw two arcs from point B, above and below the line segment.
Step 4: Label the point of intersection of the arcs above the line segment as D and below the line as E.
Step 5: Using a straightedge, join points D and E.

Question

Jason uses the following steps to construct a perpendicular through a point C on a line segment. 
 
Step 1: From point C, draw an arc intersecting the line segment in points A and B.
Step 2: Draw two arcs from point A, one above and the other below the line segment.
Step 3: Using slightly more compass width, draw two arcs from point B, above and below the line segment.
Step 4: Label the point of intersection of the arcs above the line segment as D and below the line as E.
Step 5: Using a straightedge, join points D and E.

anonymous · Answer

Part A: Which is the first incorrect step?
Part B: Using complete sentences, explain your answer for Part A.
Part C: Explain why a compass works for the construction done by Jason.