Four congruent equilateral triangles are combined to form

Four congruent equilateral triangles are combined to form a larger equilateral triangle, as shown above. If the height of the larger triangle is 1, then what is the height of the smaller triangle?

A. 2/3
B. 1/2
C. 1/4
D. 1/6
E. 1/9

The OA is B

Source: Economist GMAT

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