Answer:
D
Explanation:
The solution to the problem is  [tex]\frac{2}{cot 40}[/tex]
How did we arrive at this: 
     We are going to use trigonometric ratios to solve this problem. The diagram of the sail forms a perfect and unique right angle triangle. 
From the diagram, we can easily decipher the: 
- hypotenuse axis 
- opposite axis 
- adjacent axis
From the given diagram, we know: 
    Adjacent axis and the opposite angle;
   tan Ф = [tex]\frac{opposite}{adjacent}[/tex]
  The unknown axis faces the opposite side;
         Opposite = adjacent x  tan Ф
         Opposite = 2 x tan Ф
Note;
            tan Ф = 1/ cot Ф
 
     opposite = 2 x 1/ cot Ф