b; the industrial revolution affected northern communities more significantly than southern communities.
Wider margins are your friend. They reduce the length of each individual line of text, making your writing easier for your readers' eyes to scan. And they create mental 'breathing space'* that makes the whole document more pleasant to read.
B if you look back in the history books
<span>When Otto I freed the Pope from the control of the Romans, he was named Holy Roman Emperor.</span>