ANS:C - 18

The figure may be labelled as shown. The simplest rectangles are ABQP, PQNO, BCDN, NDEM, MEFL, LFJK, FGHR and RHIJ i.e. 8 in number. The rectangles composed of two components each are ABNO, BCEM, NDFL, MEJK and FGIJ i.e. 5 in number. The rectangles composed of three components each are ACDO, BCFL, NDJK and LGIK i.e. 4 in number. There is only one rectangle i.e. BCJK composed of four components. Total number of rectangles in the figure = 8 + 5 + 4 + 1 = 18.