Answer:
B.

Explanation:
Given:
The given function is:

The graph of another function 'g' is 6 units below the graph of the given function 'f'.
In other words, we can say that the graph of function 'g' is the transformation of function 'f' and the transformation is a translation by 6 units down as the graph of
is below the graph of

Thus, as per the rules of transformation,
If a graph is shifted down by 'C' units where 'C' is a positive number, then the function rule is given as:

Here,

Therefore, the equation of
is given as:

So, the option B is the correct answer.