Passage Summary: A guide for editors explains how to handle old-fashioned spelling and modern typos in quotes. Basically, leave old spelling alone if it's rare, but if it's common, you can update it as long as you tell the reader. Modern typos can just be fixed quietly.

Reasoning: The style manual outlines specific protocols for editors: keep rare archaic styles in old quotes, modernize frequent ones with a note or preface mention, and fix modern typos without any explanation.

Analysis: Since this is a 'Must be True' question, we are looking for a statement that is a logical consequence of the rules provided. We should treat these instructions as conditional 'if-then' statements. For instance, if an editor modernizes frequent archaic spellings in several different quotes, the rules dictate they must include a general statement in the preface. The correct answer will likely be a specific application of one of these rules or a combination of them, requiring no outside information or assumptions.