The correct option is
B 15
The simplest squares are QUYX, URVY, YVSW and XYWT i.e.
4 in number.
The squares composed of two components each are IMYP, MJNY, YNKO and PYOL i.e.
4 in number.
The squares composed of three components each are AEYH, EBFY, YFCG and HYGD i.e.
4 in number.
There is only one square i.e. QRST, composed of four components.
There is only one square i.e. IJKL, composed of eight components.
There is only one square i.e. ABCD, composed of twelve components.
Total number of squares in the given figure
=4+4+4+1+1+1=15.