Answer:
A. Alaska's oil pipeline is one of this country's greatest accomplishments.
Explanation:
Because it's correctly punctuated. The others don't make sense so.
Probably B. Having been informed
Answer:
You are, of course, my favourite student.
Explanation:
Commas can indicate pauses or short breaks, as they do in this sentence c: Read each sentence aloud, and take a short pause for every comma. You can't do this with every sentence, however, but it should help most of the time!
