Answer:
I believe the answer "The animals work efficiently in harmony" is the answer.
Step-by-step explanation:
This statement is clearly expressed in the first line of the passage "...finished the harvest in two days less time than..." Here the term "efficiency" is clearly implied.
Efficiency is also seen in: "...biggest harvest the farm had ever seen...", "...no wastage whatever...", "...gathered up the very last stalk..."
All the other options are either clearly opposed by one of the aforementioned statements or not even mentioned at all.
Hope this helps!!