Disadvantages of not having a good student preparation

There are many disadvantages of not having a good student preparation. For instance, they might develop a ''messy'' mindset over time because they are never fully prepared or involved. It is easier to pass a class if you are prepared and if you pay attention. However, the non prepared students will have more of a difficulty taking notes to gather information, therefore making them fail the class.

buenas noches would be your answer

i think its d, but grammarly says none

explanation: