TPO4第1篇阅读 第6题的题干看不懂

The numbers of deer have fluctuated markedly since the entry of Europeans into Puget Sound country. The early explorers and settlers told of abundant deer in the early 1800s and yet almost in the same breath bemoaned the lack of this succulent game animal. Famous explorers of the north American frontier, Lewis and Clark arrived at the mouth of the Columbia River on November 14, 1805, in nearly starved circumstances. They had experienced great difficulty finding game west of the Rockies and not until the second of December did they kill their first elk. To keep 40 people alive that winter, they consumed approximately 150 elk and 20 deer. And when game moved out of the lowlands in early spring, the expedition decided to return east rather than face possible starvation. Later on in the early years of the nineteenth century, when Fort Vancouver became the headquarters of the Hudson's Bay Company, deer populations continued to fluctuate. David Douglas, Scottish botanical explorer of the 1830s, found a disturbing change in the animal life around the fort during the period between his first visit in 1825 and his final contact with the fort in 1832. A recent Douglas biographer states:" The deer which once picturesquely dotted the meadows around the fort were gone , hunted to extermination in order to protect the crops."

6.According to paragraph 3, how had Fort Vancouver changed by the time David Douglas returned in 1832?
A） The fort had become the headquarters for the Hudson's Bay Company.
B） Deer had begun populating the meadows around the fort.
C） Deer populations near the fort had been destroyed.
D） Crop yields in the area around the fort had decreased.

我的原始思路是这样的，题目问的是在1932年DD回来的时候，FV已经发生了哪些变化（我一直认定主角是FV）。根据题干1832定位到本段倒数第2句，但找不到FV，再向上找到倒数第3句，发现了FV。根据原文“Fort Vancouver became the headquarters of the Hudson's Bay Company"，对比后发现A是如此完美。BCD错是因为没提主角FV
但我有2个疑点我始终解不开
1）根据211原则，如果选项中有2个的含义截然相反，那么答案必定是其中1个。例如本题BC，B说鹿数量增加了而C说鹿已经灭绝，据此应该选B或C
2）A似乎跟本段的topic sentence无关，本段甚至全文都是在讲鹿的数量变化，而A跟鹿的数量变化毫无关系

原谅我的too young too naive，这题我一直搞不懂为何A是错的，莫非是题干理解有误？题干不是说在1932年DD回来的时候，FV已经发生了哪些变化么？跪求解释，跪求拍醒！！！