Answer:
D) The third side could be 4 meters long.
Explanation:
The third side of a triangle must be greater than the difference and less than the sum of the other two sides.
5-4=1
5+4=9
So the third side must be GREATER THAN 1 and LESS THAN 9. (1<x<9)
Therefore, the answer can't be A or C. The second one could be correct, depending on how much less than 4 it is. But the last one is definitely correct.