Which answer choice does not contain any punctuation errors? a. "beavers, by the way," said melinda, "are herbivores." b. "i'm home, brian said." c. are badgers omnivores? david asked. d. he commented "that they eat vermin such as rats."

A. "Beavers, by the way," said Melinda, "are herbivores."Is correct. Because it has properly used the quotation marks and the comma.
Why the rest is incorrect is because a quotation mark is when you quote what someone has said.
Use B as an example : "I'm home, Brian said." - The quotation marks have to be at the end of 'home,' because the person who is actually saying it wouldn't include 'Brian said' in their speech.