Which of the Following Scenarios Demonstrates the "Empty Vessel" Approach

Which of the following scenarios demonstrates the "empty vessel" approach to teaching?

A) Brian and his aides are walking with their preschoolers in the park. Brian asks them what they see, on the ground and in the sky, as they collect rocks and leaves for an art project later in the day.
B) Candice is passing out handouts of pictures of various labeled shapes for her preschoolers to color.
C) Daniel has setup a water table with objects of various shapes, sizes, and weights for his preschoolers play in.
D) Betsy and her aids are helping their preschoolers make home-made play dough.