19) How many of the developments drawn below can be closed (by folding along the marked lines) to form closed boxes?
$\begin{array}{lll}\text { (A) } 1 & \text { (B) } 2 & \text { (C) } 3\end{array}$
(D) 4 (E) 5 .
![](https://cdn.mathpix.com/cropped/2024_04_17_f693bde306ad8eee0381g-2.jpg?height=282&width=998&top_left_y=266&top_left_x=1632)
19) The answer is (C). The first and fourth cannot be closed, the second, third, and fifth can.