T-4-Q33 快要考了，看得脑袋不转了，谁能帮我看看这题呢？好像以前没人问过，应该不是难的
In attempting to solve the problems caused by a lowering of the price of oil, oil companies operating in the North Sea have taken a variety of approaches, which includes their reducing employment, using new technology to pump oil more efficiently from smaller fields, and finding innovative way to cut the cost of building and operating platforms.
A.
which includes their reducing employment, using new technology to pump oil more efficiently
B.
which includes reducing employment, using new technology to be more efficient in pumping oil
C.
which include reducing employment, using new technology to pump oil more efficiently
D.
which include the reduction of employment, their using new technology to pump oil more efficient
E.
including a reduction of employment, their use of new technology to be more efficient at pumping oil 答案是C, 我的问题是为什么这里which的修饰对象是approaches 而不是a variety of approaches ？而下面是PP1中类似的一题选A, 用的就是单数.这两题在我看来只是which 和that 不一样,但为什么数上不同呢？
According to two teams of paleontologists, recent fossil discoveries in Pakistan show that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today includes cows, camels, pigs, and hippos--than to any other mammals.
(A) that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today includes cows, camels, pigs, and hippos--than
(B) that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today include cows, camels, pigs, and hippos--as
(C) whales, porpoises, and dolphins to be more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today include cows, camels, pigs, and hippos--than they are
(D) whales, porpoises, and dolphins as being more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today includes cows, camels, pigs, and hippos--as they are
(E) whales, porpoises, and dolphins as more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today include cows, camels, pigs, and hippos--than
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