Look at the shape and the dots inside it. Two things change from A to B. Which answer figure is related to C in the same way?

From A to B the shape gains a side (triangle to square) and loses a dot (3 to 2). So the pentagon with 2 dots becomes a hexagon with 1 dot: (c). (a) adds a dot, (b) takes a side away and (d) keeps the pentagon.