The software update improved system performance significantly _______ it also introduced new security features that protect user data.
Which choice completes the text so that it conforms to the conventions of Standard English?
significantly, it
significantly; and
significantly and,
significantly, and
Correct Answer: D
Choice D is the best answer. This question tests comma usage with coordinating conjunctions (FANBOYS).
- Context clues: Two independent clauses are joined by "and."
- Meaning: Use a comma before a coordinating conjunction joining two independent clauses.
- Verify: "The software update improved system performance significantly, and it also introduced new security features" is correctly punctuated.
💡 Strategy: Use comma + FANBOYS (for, and, nor, but, or, yet, so) to join two independent clauses.
Choice A is incorrect because joining independent clauses with only a comma creates a comma splice. Choice B is incorrect because a semicolon before "and" is unnecessary and awkward. Choice C is incorrect because the comma is placed after "and" instead of before it.