Given question is incomplete; find the complete question in the attachment.
Fraction given in option (3) will be the answer.
Given expression in the question,
- [tex]\frac{3}{\sqrt{7} }[/tex]
Multiply numerator and denominator of the fraction by √7,
[tex]\frac{3}{\sqrt{7} }=\frac{3}{\sqrt{7} }\times \frac{\sqrt{7} }{\sqrt{7} }[/tex]
[tex]=\frac{3\sqrt{7} }{7}[/tex]
Therefore, Option (3) will be the answer.
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