You Are Laying Phone Cable Between Two Cities and Must

You are laying phone cable between two cities and must cross a lake.You will lay L miles on land.The cost C, in dollars, depends on how much cable is on land and how much is in water.The relationship is . ​
How much cable do you lay on land to achieve a minimum cost, and what is that minimum cost? Round your answers to two decimal places.
​

A) The minimum cost of $7.25 is achieved if you lay 2543.73 miles of cable on land.
B) The minimum cost of $2543.73 is achieved if you lay 7.25 miles of cable on land.
C) The minimum cost of $5.32 is achieved if you lay 2541.63 miles of cable on land.
D) The minimum cost of $2541.63 is achieved if you lay 5.32 miles of cable on land.