Here's a problem to solve: A lake has been used for more than a century to irrigate crops. How has this practice most likely affected this resource?

Among the 4 following options, which is the correct answer?

- A: It decreased the salt content of the water.
 
- B: It increased the evaporation rate of the water.
 
- C: It increased the number of fish in the lake.
 
- D: It decreased the volume of the lake.
 