Question #N523

The discovery of the fossilized remains of a mixopterid eurypterid, known as a sea scorpion, on the paleocontinent of Gondwana, was significant because it expanded the understanding of mixopterids’ geographical distribution. 

Which of the following is the most effective way to revise the sentence so that it conforms to the conventions of standard English?
A. The discovery of the fossilized remains of a mixopterid eurypterid, known as a sea scorpion, on the paleocontinent of Gondwana was significant because it expanded the understanding of mixopterids' geographical distribution.
B. The discovery of the fossilized remains of a mixopterid eurypterid, known as a sea scorpion, on the paleocontinent of Gondwana, was significant because it expanded the understanding of mixopterids’ geographical distribution.
C. The discovery of the fossilized remains of a mixopterid eurypterid, known as a sea scorpion on the paleocontinent of Gondwana, was significant because it expanded the understanding of mixopterids’ geographical distribution.
D. The discovery of the fossilized remains of a mixopterid eurypterid, known as a sea scorpion, on the paleocontinent of Gondwana, was significant, because it expanded the understanding of mixopterids’ geographical distribution.

Correct Answer is: A

The sentence in Choice A is the best way to revise the sentence. The comma after "Gondwana" is unnecessary because it separates a nonessential element from the rest of the sentence. The apostrophe after "mixopterids" is needed to show possession in the phrase "mixopterids' geographical distribution."