Sentence C ('Even though it looked like rain, Carmen didn’t take her umbrella to work.') is the best example of foreshadowing. It hints at possible future events. The other sentences are reviewed and corrected for proper comma usage.
Option C is the best example of foreshadowing because it hints at a potential future event or outcome. In this case, the fact that Carmen doesn't take her umbrella despite the ominous weather suggests that she might face some challenges or consequences related to not being prepared for the rain.
This subtle detail creates anticipation and sets the stage for a possible event that could occur later in the narrative, making it a foreshadowing element. The other options do not provide the same sense of anticipation or suggestion of potential future events.