Question

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

Answer 1

The correct option is D Sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on

The errors here are related to subject-verb agreement. B, C and E are eliminated on this basis- the singular verbs 'has/ was/ was' do not agree with the subject (plural) of the sentence. In A, the word 'it' has no clear antecedent. Thus, D with its clear direct structure and proper subject-verb agreement is the correct answer.