GMAT Sentence Correction (SC) | Fossils of the arm of a sloth found in Puerto Rico in 1991,

Fossils of the arm of asloth 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
-->it clearly and truly modidiessloth . The issue in this sentence is meaning:that fossils have been dated at 34 million years old makes the sloth the earliest known mammal , notfossils makes the sloth the earliest known
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