Answer: Option 'C' is correct.
Step-by-step explanation:
Since we have given that
Length of remodel = 12 foot
Width of remodel = 8 foot
We need to first find the area of remodel:
As we know the formula for area of remodel i.e. Length × Breadth.
So, Area becomes,

Cost of per square foot = $21
So, Cost of total area would be

Hence, Option 'C' is correct.