I also think C achieving would be the core answer
I believe the correct answers are 4 and 5.
Understanding the basics of a subject and taking notes in class are components of passive learning - that is, listening to someone, learning what we have heard, and trying to reproduce it. Understanding how to get good grades is not even a component of learning. The 4) and 5) options are the only ways to get really involved in the learning process, trying to apply what was learned, or trying to broaden up one's knowledge on a subject.
Not to long ago, I was awarded with an All American cheerleader badge. I soon after tripped and injured my ankle, I was devastated. I overcame this challenge by giving the tryouts all my effort, and sure enough, I made the team.
Answer:
1. Their forest habitat is home to numerous other species
2. protecting gorillas helps protect other vital plants, animals, and insects as well
3. it's predetors will have much less food to eat