Did I pick the right answer?

C

Step-by-step explanation:

The domain of a function is the span of x-values.

And the range of a function is the span of y-values it covers.

From the graph, we can see that the span of x-values the graph covers goes from x=1 to x=6.

In other words, the domain is all numbers between 1 and 6 including 1 and 6.

In an inequality, this is:

For the range, we can see that the lowest the graph goes is y=1, and the highest it goes is y=7.

So, the range is all numbers in between 1 and 7 including 1 and 7.

In an inequality, this is:

Thus, the correct answer is C.

D is half correct, but the domain and range is flipped, so that may be your mistake. Be more careful next time!

is there any photos or whatever?

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this