Strips are made up of identical copies of $\square$. Each $\square$ has length $\frac{2}{3}$. Which strip has length 4 ?

(A) |  |  |  |  |  |  |
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(B)

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(C) $\square$

(D) | $\square$ |  |  |  |
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(E)

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Since each $\square$ has length $\frac{2}{3}$, then a strip of three $\square$ will have length $3 \times \frac{2}{3}=2$.

We need two strips of length 2 to get a strip of length 4 .

Since $3 \square$ make a strip of length 2 , then $6 \square$ make a strip of length 4 .

ANSWER: (A)