Select the option that represents the number of triangles in the given figure.

For the square portion ,

Formula is : Number of diagonals $$\times$$ Number of blocks

So , number of triangles within square is 2 $$\times$$ 6 = 12

Now , there are two triangular portions remaining.

The one at the bottom , will contribute one more , making total number of triangles 13.

Now, include the upper triangle : It will contribute 3 + 2 =5 

So , the total number of triangles is 18.

So, the answer would be option c)18.