9. Combine the radical expression, if possible.

we conclude that:

Hence, the last option i.e. is correct.                      

Step-by-step explanation:

Given the expression

Combining the radical expressions

let us first solve

Apply radical rule:  

Apply radical rule:  

Thus,

similarly solving

Apply radical rule:  

Apply radical rule:  

Thus,

so we get

so the expression becomes

       ∵ ,

                                          ∵

Therefore, we conclude that:

Hence, the last option i.e. is correct.