Answer:
The correct option is 3. Table C represents a function.
Step-by-step explanation:
If in a relation, for each input there exist a unique output, then the relation is called function.
It means for each value of x, there exist a unique value of y.
In table A, the values of function are -9 and -8 at x=8.
Since there exist more than one value of y for single value of x, therefore Table A does not represent a function.
In table B, the values of function are 12 and 13 at x=7.
Since there exist more than one value of y for single value of x, therefore Table B does not represent a function.
In table D, the values of function are 0 and 4 at x=10.
Since there exist more than one value of y for single value of x, therefore Table D does not represent a function.
Only Table C represents a function. Option 3 is correct.