The correct option is C x = 5, 6, 7, 8, 9, ...
Given, 5x≥25
Multiplying both sides of an inequation by a positive number doesn't change the sign of the inequation.
Multiplying both sides by 15,
⇒5x5≥255⇒x≥5
∴ Any number greater than or equal to 5 satisfies the above inequation.