Somebody burnt the trash here. It can’t be Sheena because she cares ____ the environment pretty much.

The correct answer is About because the phrasal verb 'care about' means to feel concern, affection, or a sense of responsibility for something.

• About: This is the correct choice. When expressing emotional investment or protective consideration toward an abstract concept, cause, or the global ecosystem, the verb 'care' relies on the preposition 'about'.
• Incorrect Options:
  • Of / In: These are incorrect. Combining 'cares of' or 'cares in' creates an invalid phrasal verb combination that fails to convey structural or semantic meaning.