______ they have finished the task, let the children have a rest and play for a moment.

A. Naturalists’ Beliefs about Elephants
B. Amazing Experiments about Elephants
C. An Unexpected Finding about Elephants
D. A Long Scientific Debate about Elephants

A. The conversation of African elephants.
B. The purpose of studying African elephants.
C. The way to divide African elephants into two units.
D. The reason for the distinction of African elephants.