Here's a problem to solve: A snack consists of peanuts, sunflower seeds, raisins, almonds, and chocolate pieces. Which statement describes why this is a mixture?

Among the 4 following options, which is the correct answer?

- A: It is made up of more than one substance.
 
- B: It is impossible to separate the substances.
 
- C: The components retain their original properties.
 
- D: The components chemically combine with each other.
 