A shift in thought can be indicated by what is called an em dash. An em dash is used to set of an interruption that is closely relevant to
the sentence but is not grammatically part of it. These set of
interruptions can be found in a list, illustration, restatement, shift
in thought or tone, summary, or dramatic point.
Hope this helps, if you need anymore help or further explanation just let me know!! :)
the correct answer is C. During World War II, many men were drafted, others volunteering to serve. as we noticed it has perfectly placed punctuation and combines both sentences with ease.
hope this helps:)
