Answer:
C. [tex]1.90\leq x \leq 2.10[/tex]
Explanation:
The question states that x has is value in between and including 1.9 and 2.1. So the number is greater than or equal to 1.9 but less than or equal to 2.1.
In option A [tex]x\geq 2.1[/tex] this means that the value of x is greater than or equal to 2.1 which does not satisfy the condition mentioned in the question
In option D [tex]x[/tex] is greater than or equal to 2.1 but less than or equal to 1.9 which does not satisfy the condition mentioned in the question.
In option C [tex]x[/tex] is greater than or equal to 1.9 and less than or equal to 2.1 which does satisfy the condition mentioned in the question.
So, option C is correct.