Which of the following sentences uses a coordinating conjunction in a compound sentence?

A. The budget payment is much higher than we anticipated, but the price of heating oil has skyrocketed this year.
B. Out in the yard, the children shouted loudly and threw silly insults at each other.
C. We fired our old housekeeper, who we thought had stolen Grandma's rings; we later regretted it.
D. My aunt, who usually behaves like a queen, was suddenly asking–no, begging–for help.

my answer is a.

Right, again!

B

That's correct! Sentence A, "The budget payment is much higher than we anticipated, but the price of heating oil has skyrocketed this year," uses a coordinating conjunction in a compound sentence. The coordinating conjunction used in this sentence is "but," which joins two independent clauses ("The budget payment is much higher than we anticipated" and "the price of heating oil has skyrocketed this year") to form a compound sentence. Great job!