Please choose the correct answer to the question: A lake has been used for more than a century to irrigate crops. How has this practice most likely affected this resource?

Answer1: It decreased the salt content of the water. Answer2: It increased the evaporation rate of the water. Answer3: It increased the number of fish in the lake. Answer4: It decreased the volume of the lake.

Answer format: answer1/answer2/answer3/answer4