The next step in the bisection of the segment is to D. Swing an arc that intersects segment CD.
From the information given, Ian is bisecting segment CD. He places the compass on point D, opens it to a width larger than half of the segment, and swings an arc on both sides of segment CD.
After keeping the compass the same width and places it on the other point, it's important to swing an arc that intersects segment CD.
In conclusion, it's D.
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