Answer:
The answer is "Option C".
Explanation:
In the given question attachment of the table is missing which can be defined as follows:

In given table a method f(x) values corresponding to different values of x.
We needed to try f(0) value that is in this method, we have to calculate the f(x) value if x=0
As we've seen from the table the f(x) value at x=0 is 6
That's why the correct choice is option C that is 6.