Can someone please help me I will give a lot of points and a brainliest

Answer:
Step-by-step explanation:
↝m√p + n√p -√p
↝√p(m+n-1)
↝(m+n-1)√p = √p(m+n-1)
↝(m-n+1)√p ≠ √p(m+n-1)
↝(m-n-1)√p ≠√p(m+n-1)
hence, option 1st is correct ✓
Option A
Let's verify
[tex]\\ \rm\Rrightarrow (m+n-1)\sqrt{p}[/tex]
[tex]\\ \rm\Rrightarrow m\sqrtp}+n\sqrt{p}-\sqrt{p}[/tex]
Hence verified