A:Though swamp-like, Florida's Everglades are actually a 60-mile-wide river, the waters of which can take
months to reach their final destination in Florida Bay. [correct]
B: Though swamp-like, Florida's Everglades are actually a 60-mile-wide river whose waters do take months to reach
their final destination in Florida Bay.=> do take months is an odd construct here. whose can be used to refer to the river, though.
C: Though swamp-like, Florida's Everglades are actually a 60-mile-wide river, whose waters can take months to reach
its final destination in Florida Bay. => its does not refer to the waters.
D: Though swamp-like, Florida's Everglades are actually a 60-mile-wide river, the waters of which can take months
to reach its final destination in Florida Bay.=> same reason as above
E: Though swamp-like, Florida's Everglades are actually a 60-mile-wide river, and they can take months to reach their
final destination in Florida Bay.=>what does they refer to?

I might be wrong though, as I am confused if the use of its is correct, in C and D.
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@ Marcab : thanks for ur explanation...
But why not D? ..
" its" refers to "Florida's Everglades".
Because we are speaking about "Florida's Everglades" water to reach Bay.
isn't it??

waiting for OA and OE
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Thanks again....

hmm... ya i agree...
Anyways lets wait for OA and OE....
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Hii Daagh.
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I too had the same doubt, but decided to answer with the best available.
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Here is another version describing "Everglades" as singular
(http://www.dep.state.fl.us/secretary/ki ... glades.htm)

The Everglades, spanning the southern tip of the Florida peninsula, is
the largest remaining subtropical wilderness in the United States. It is actually a river,
or wetland, featuring broad, shallow, slow moving water. Some call it a big swamp.

Nicknamed "the river of grass," the Everglades is home to an unusual plant called sawgrass. In some areas, the
water is barely visible because the sawgrass is so thick.

Known for its rich animal and plant life, the Everglades is the only place in the world where
alligators and crocodiles exist side by side. It is a refuge for large wading birds, such as the roseate spoonbill, wood
stork, great blue heron and a variety of egrets. Featuring temperate and tropical plants, the river holds mangrove
and cypress swamps, pinelands and hardwood hammocks.

On December 6, 1947, President Harry S. Truman dedicated the area as Everglades National Park to ensure protection
of its unique plant and animal habitats. The park is home to many endangered species, including the Florida panther.

Today, the real Everglades is one half its original size. Both federal and state governments are committed to restoring
and protecting this national treasure. There is only one Everglades.

This article said it all- "The Everglades" is a proper noun (swamp, river, a park etc) and should take a singular noun.
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I feel B generalizes the scenario.
How can waters from all 60 mile wide rivers drain into Florida bay.
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There is no confusion: basically Everglades is a BIG river, here the concern are the waters, whatever Everglades is or are
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What is the official answer? I feel waters is plural ans shud be refferred to by "their" instead of "its" hence "A"