The correct spelling answer is a
Answer:
Knowledge
Explanation:
Knowledge could be defined as information, facts, skills gathered through experience or education. In the case above, the student has knowledge of how his "class average" works and so he "knows" that if he works hard enough, he can improve it to a B. However if he didn't have this knowledge, he probably would have started panicking and already think there isn't any hope of improving his average.
Answer: c) simplified description or representation of reality.
Explanation:
Model is defined as the representation of any object, person or real-world component through its structure, illustration, form and description. It helps in enhancing the understanding of the entity through the formation of replica of that entity.
Other options are incorrect because fact, statistic ,observation or any other measurement unit does not describe the model that is representing any real world entity. Thus, the correct option is option(c).