Teacher:In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
Teacher: Now, understand the problem? Solve this instance: the best way to improve production in future yields on the farm is (A) planting cabbage one year and spinach the next (B) chemical fertilizers and salts (C) rotating water schedules daily (D) over watering each field
Student:
A