Use the given information to answer the question: What does the function A(t) represent in the context of the average number of acres on a U.S. farm?
A) The average number of acres on a U.S. farm over time
B) The rate of change of the average number of acres on a U.S. farm
C) The maximum number of acres on a U.S. farm
D) The minimum number of acres on a U.S. farm