PP2 CR # 108

[autumn713]

108. The inhabitants of Polynesia's Easter Island once hunted porpoises in the island's surrounding waters, using canoes hewn from large trees that used to grow on the island. Archaeologists have found many porpoise bones that date from before A.D. 1500 but none that date from later. Since other evidence suggests that the islanders continued to regard porpoises as desirable food, the large trees needed to make the canoes must have disappeared prior to 1500.
Which of the following, if true, most seriously weakens the argument given?
(A) Around 1500, a long-term shift in the ocean currents caused the fish species on which porpoises feed to leave the water around Easter Island.
(B) Easter Island's inhabitants used the large trees there for many purposes other than constructing their canoes.
(C) Before 1500, Easter Island's inhabitants also used canoes to harvest shellfish from the island's surrounding waters.
(D) Before 1500, Easter Island's inhabitants made artifacts from certain porpoise bones.
(E) Treacherous currents in the water surrounding Easter Island made swimming there extremely dangerous for the island's inhabitants.

Don't have ANS this one.
I vote for A, but my friend vote for D.

How's everyone think?
Thanks.
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The reason for choosing A is because I think "tress are not disappeared" is where to weaken against..instead of why there is no more P bones...

Thanks.

[dibert8]

覺得是 (A), 因為 porpoise 游離小島,不適合再以 canoe 去捕捉;不做 canoe 不代表沒有樹了
(B) 無關於 other than constructing their canoes
(C) 無關於 shellfish
(D) 支持 bone 的發現, 1500 之後沒講,就不作推測; 沒提到 tree 和 canoe, 而且"時間焦點錯誤"(摘自兔大 CR 總結).
(E) 無關於 swimming

不過有個問題:既然還吃 porpoise 為什麼沒有 bones ? (假動作,故佈疑陣?)