Answer: Third option is correct.
Step-by-step explanation:
Since we have given that
Cost of producing 4 metal units = $204.80
Cost of producing 8 units = $209.60
Let x be the number of units and y be the cost of units.
So, we will first find the slope of (4,204.80) and (8,209.60)
So, slope would be

So, Equation of line using the two point slope is given by

Now, we need to find the cost of 14 units.
Here, x = 14 units.

Hence, Third option is correct.