Which of the following observations of children is the most objective?
A. Chris took a toy truck from Alex. Alex cried, became angry because Chris took the truck, and then stamped his feet on the floor. He snatched the truck back from Chris, and ran to the caregiver.
B. When Ann finished drawing with crayons, she put them back in the box and returned the box to the shelf, whereas Sue, obviously less disciplined, left hers scattered on the table.
C. Joan was playing with blocks, building a structure, when Missy joined her. Joan looked afraid because Missy was much larger than she. But she eventually overcame her fear and let Missy play with the blocks.
D. Eddie went to the shelf and chose a teddy bear to play with. He took a plastic spoon and bowl and repeatedly moved the spoon from the bowl to the bear's mouth.

I'd say D. A uses words that suggest the author has an opinion of Alex's behavior that is unfavorable. B uses the words "obviously less disciplined" to refer to Sue, which is clearly an opinion and also rather unfavorable. C makes assumptions as to Joan's emotions toward Mary, which cannot be ascertained objectively without asking Joan. D is a clear statement of the facts without embellishment.

EDIT: Note that the definition of objective is not influenced by opinions or beliefs, as opposed to subjective.