Ethan is worried because ....

• The audio file is titled "Food and Cooking.mp3", suggesting the conversation might be related to food or cooking.
• The options provided are: "he doesn't know how to cook", "he doesn't like bread", and "they haven't got much money".
• Without listening to the audio, it's impossible to definitively determine why Ethan is worried. However, if the context is about cooking, not knowing how to cook is a plausible reason for worry.

The correct answer cannot be determined from the provided image alone, as it requires listening to the audio file.