Answer:
c.
![1\leq x\leq 6](https://img.qammunity.org/2021/formulas/mathematics/middle-school/htkut98s4krhq13mr552pmp7x7jzufyusp.png)
Explanation:
the domain is the set of all possible inputs of a function, in other words, all the x-values that make up the function. in this function, the first x-value is 1, and the function is continuous all the way up to 6, so, the domain would be the answer in c.