19) The answer is (C). The first and fourth cannot be closed, the second, third, and fifth can.
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)