The correct option is D 7
Concept Involved––––––––––––––––––––:
When two fractions have the same numerators, then the largest fraction is the one with the smallest denominator.
Method–––––––––:
Given, order of fractions: 58<5x. This order is possible only when the value of x is less than 8
From the given options, 7 is a possible value of x because the other numbers are greater than 8.
58<57⇒7<8 (Order of denominators).
Therefore, the value of x should be 7.