Natalie is completing a construction of an equilateral triangle inscribed in a circle as shown below. what should be the next step in her construction?

construct a line perpendicular to the line ab to create four congruent quadrants.

construct six equal sections around the circle using the original radius as a guide.

construct another point c anywhere on the circle to be the third vertex of her triangle

draw arcs above and below line ab to show where the triangle sides meet.