Knowing that Dan must ask a statistical question to his friends, it is important to know the definition of "Statistical Questions".
Statistical Questions are defined as those questions that need a collection of data and have the data obtained has variability.
In this case, you need to identify if the questions provided in the options satisfy that definition:
1. The question "What is your favorite food?" can be answered with data that vary, because each friend has a favorite food that can be different from the others.
2. The question "What is the color of lemon?" is not a clear question for collecting data. It is ambiguous.
3. The question "What is the capital of Spain?" has only one correct answer.
4. For the question "What is George's favorite food?" Dan could obtain ambiguous answers.
Hence, you can conclude that the answer is: Option 1.