Answer:
c. Use a compass to swing an arc on either side of the segment for each endpoint.
Step-by-step explanation:
The steps to constructing a perpendicular bisector are illustrated in the attachment.
Steps 2 and 3 are described by answer choice C.
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Other choices
(a) In order to get the arcs to intersect each other, their radius must be more than one half of the segment length.
(b) At no point in the construction are concentric circles involved.
(c) A ruler is not used in any construction. Only a straightedge with no markings will be used for construction.