Logic: We have to count the number of the rhombus in the given figure.A rhombus is a parallelogram where all sides are equal.A rectangle is a parallelogram where one angle is 90°.A square is a parallelogram where all angles are 90° and all sides are equal.Both Squares and rhombuses have all sides equal.Thus, All squares are rhombuses.The number of rhombus is as follows: BDFG, DGHC.EFLK, FGLM, GHNM, HION.KLQR, LMSR, MNTS, NOUT, RSWV, STXW.CBLN, IUSG, QEGS, VLNX and RFHT.The total number of rhombus is 17.Therefore, the correct answer is "Option 4: 17".Mistake PointsA rectangle is a parallelogram with all its interior angles being 90 degrees.A rhombus is a parallelogram with all its sides equal. For a rectangle to be a rhombus, its sides must be equal. If the condition is satisfied then it becomes a square.The opposite angles of a rhombus are equal.There are two obtuse angles and two acute angles.All four sides of a rhombus are equal.The diagonals are not equal, but they intersect at 90 °.A rectangle is therefore not a rhombus. Thus for counting Rhombus, the number of rectangles will not be counted.