How many separate pieces of fabric are used to form a bow and knot added as a decoration down the center of a dress

A) Two
B) Three
C) Four
D) Five
Guessing that the answer could be A or C as fabric has raw edges which needs to be joined together on the wrong side,turned over and then formed.Also the same for the knot of the bow.So I figure 2 pieces of fabric for the bow and 2 for the knot

Why are you guessing? Don't you have course materials (textbook or ??) that make this clear?