D. After you've read the text, coded it and re-read any sections you didn't understand
According to Pi, a zookeeper will know he or she has created a healthy environment for the animals WHEN THE ANIMALS REPRODUCE.
For animals to reproduce and give birth to young ones, many things has to be in place, such as suitable partners, right environment, right food, etc. Animals naturally reproduce when the environment is favorable unto them. Thus, reproduction of animals in the zoo shows that the right environment has been created for the animals.
The correct answer is C.
To determine the tone of a text, you have to look at the word choices of the text and see what effect they have on the text
