A). No. Even end-to-end, the 5 and the 3 couldn't cover the 9.
B). Technically yes, but not really. End-to-end, the 5 and the 2 would lay down right on top of the 7. It would be a triangle with two angles of 0° and one angle of 180°. The base would be 7, the height would be zero, and the whole thing would just look like a piece of line.
C). No. Even end-to-end, the 2 and the other 2 couldn't cover the 5.
