Let's begin by identifying key information given to us:
1, 3, 5, 7, 9 are all odd numbers
1 is the minimum number & 9 is the maximum number
Set-builder notation means a mathematical notation to describe a set of numbers having a definite condition which is met by all the elements in that set
Hence, the set-builder notation is given by:
![\mleft\{x\colon1\leq x\leq9,whereX=OddInteger\mright\}](https://img.qammunity.org/2023/formulas/mathematics/college/k2f2zpewhnr80d3axqy3af8iwhoq6c6tgl.png)
Hence, option D is the correct answer