Final answer:
The number of physicians did not necessarily decrease between 1965 and 1980, as there is insufficient data to determine this.
Step-by-step explanation:
The question asks whether the number of physicians decreased between 1965 and 1980. To determine the answer, we would need data on the number of physicians for those years. However, without that specific information, we cannot definitively say whether the number of physicians decreased or not. Therefore, the correct answer is B. False.