The giant squid (*Architeuthis dux*) has long captivated researchers, but its deep-sea habitat makes direct observation extremely difficult. In 2004, Japanese marine biologists captured the first active images of a live giant squid in its natural environment. This historic achievement ______ helped scientists understand the predatory behaviors of this elusive creature.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A, which occurred off the coast of the Ogasawara Islands—
- B—which occurred off the coast of the Ogasawara Islands,
- —which occurred off the coast of the Ogasawara Islands—Cevap
- Dwhich occurred off the coast of the Ogasawara Islands
Cevap
The correct answer is the choice that uses matching em dashes to set off the nonessential relative clause.
The correct choice uses a matching pair of em dashes to set off the nonessential relative clause 'which occurred off the coast of the Ogasawara Islands' from the rest of the sentence. Nonessential elements must be set off from the main clause by matching punctuation marks: either two commas, two em dashes, or two parentheses.
Adım Adım Çözüm
Anahtar Kavram
Punctuation of nonessential elements