Marine biologists have observed that octopuses can solve complex puzzles _______ this cognitive ability suggests a level of intelligence previously underestimated in invertebrates.
Which choice completes the text so that it conforms to the conventions of Standard English?
puzzles, this
puzzles this
puzzles; this
puzzles: this
Correct Answer: C
Choice C is the best answer. This question tests semicolon usage between related independent clauses.
- Context clues: Two independent clauses are closely related in meaning.
- Meaning: A semicolon can connect two related independent clauses without a conjunction.
- Verify: "...can solve complex puzzles; this cognitive ability suggests..." properly links the two complete thoughts.
💡 Strategy: Use a semicolon to join two independent clauses that are closely related in meaning.
Choice A is incorrect because a comma alone creates a comma splice. Choice B is incorrect because a run-on sentence results from no punctuation. Choice D is incorrect because a colon typically introduces a list, explanation, or elaboration, not a loosely connected statement.