When Area of rectangle is constant, then the length x is inversely proportional to the width y of the rectangle.

We know that the area of a rectangle is given by the product of the length and width of the rectangle. 
Area = Length*Width
In this given problem,
The length of the rerectanglctangle is represented by x
and the width of the rectangle is represented by y
If the area of the rectangle is represented by A now.
So by the formula, 
A = x*y
When A is constant then,
x = A/y 

So from the above calculation we can conclude that about relation between length and width that, 
"When Area of rectangle is constant, then the length x is inversely proportional to the width y of the rectangle."
Learn more about Area here -
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Answer 
c= 6 
In the picture is how the solution was done
 
        
        
        
Interest = PRT/100
I= 14000*0.12*3
I=5040
Add Interest to the Principal
14000 + 5040
= $19,040 
A is the answer.