The resultant of two forces $P\text{N}$ and $3\text{N}$ is a force of $7\text{N}$. If the direction of $3\text{N}$ force were reversed, the resultant would be $\sqrt{19}\text{N}$. The value of $P$ is:

1. A
   $5\text{N}$
2. B
   $6\text{N}$
3. C
   $3\text{N}$
4. D
   $4\text{N}$