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Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
A. sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
B. sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
C. sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
D. sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
E. sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of
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Should be D.
Correct SVA and also removes ambiguity if any resulting from use of "it" in the last clause.
Fossils of the arm of a sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on the Greater Antilles islands.
B, C and E contain SVA errors.
A has a ambiguous pronoun "it". Though logically there is no other noun that could be its referrent, its too far from the sloth to clearly indicate the right referrent, the sloth.
Additionally, "on the islands" is preferred over "of the islands."
Ex: Residents of Hawaii often make off island trips to the mainland.
Ex2: The mystic Silver Sword, a plant that can be found on the island of Maui, gets its name from the colour and shape of its leaves. The plant grows for 30-50 years, blossoms once, then dies.
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