Multiply, and Then Simplify If Possible $\sqrt { 5 } ( \sqrt { 5 } + x \sqrt { 10 } )$

Multiple Choice

Multiply, and then simplify if possible. Assume all variables represent positive real numbers.
- $\sqrt { 5 } ( \sqrt { 5 } + x \sqrt { 10 } )$

A) $10 + x \sqrt { 2 }$
B) $5 + x \sqrt { 2 }$
C) $5 + 5 x \sqrt { 2 }$
D) $5 + 5 \times \sqrt { 10 }$