Rd 1: work 1 sc, 1 hdc, 1 dc in 2nd ch from hook. Drop A (draw up a long loop to avoid losing the stitch). With B, working in the same ch, draw a loop and work: *1sc, 1 hdc, 1 dc*. Drop B. Repeat from * to * with color C and D.
You have now a circle with 4 segments each in different colors, 3 stitches of each color, for a total of 12 stitches.