The bigger triangle inside the rectangle have 4 smaller pieces of triangle, 1 large triangle,
3 medium small size triangle and 2 medium size triangle.
And in the corners of the rectangle , 4 smaller size of triangle and 2 medium size triangle is there.
So, a total of $$\left(\left(4+3+2+1\right)+4+2\right)=16$$ pieces of triangle present in the diagram.
B is correct.
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