Simplify.
[tex]m\sqrt{p} + n\sqrt{p} - \sqrt{p}[/tex]

Answer:
First option is the correct answer.
[tex] (m + n - 1) \sqrt{p} [/tex]
Step-by-step explanation:
[tex]m\sqrt{p} + n\sqrt{p} - \sqrt{p} \\ \\ = (m + n - 1) \sqrt{p} [/tex]