During an experiment, iron powder and sulfur powder were mixed thoroughly and placed on a filter paper. When a magnet was moved below the filter paper, the iron fillings stood up vertically as they were attracted by the magnet. The sulfur powder showed no change in position. Which of the following correctly justifies the observation? (4 points) Group of answer choices

Iron and sulfur formed a compound; therefore, they lost their individual properties.

Iron and sulfur formed a compound; therefore, they retained their individual properties.

Iron powder and sulfur powder combined physically; therefore, they lost their individual properties.

Iron powder and sulfur powder combined physically; therefore, they retained their individual properties.