Given that Carla has already knowledge of the example from the Ecology textbook, then her reading will increase. It is called a prereading, it is a technique in which the reader will skim the text before reading it thoroughly.
Carla already has an idea on what she will be ready since she has come across the example before reading the text carefully.
I might be wrong but i think its a fragment sentence to be sure look up the definition of the answer choices that sometimes help me figure out the answer.
