Cambridge Primary (1-6). Stage 2. Science. Workbook - Unit 5: Light - Question 11

The children can see that the Sun has nearly gone and the Moon is in the sky.
Sofia says, “The Sun is a light source.” Arun says, “The Moon is bright – it must be a light source.” The child on the right says, “The Moon is not a light source – it reflects light from the Sun.”
Which child is wrong?