Zelda Is Talking to Her Grandmother on the Phone

Zelda is talking to her grandmother on the phone. You know that Grandma has asked Zelda a question because Zelda begins nodding. You tell Zelda that Grandma cannot see her nodding, so Zelda just nods her head more vigorously. She later tries to "show" her grandmother her new doll by holding it up in front of the phone. Zelda's inability to see the world except from her own viewpoint is referred to as

A) egocentric thought.
B) object permanence.
C) conservation.
D) formal operational thought.