The appropriate preposition here is "in." The phrase "I left my jacket in the car" indicates that the jacket is located inside the vehicle. Using "on" would suggest it is resting on a surface, while "at" would indicate a general location, and "under" suggests being beneath something. Mastery of prepositions that indicate location is essential for clear communication. Misusing them can create confusion about where items are placed; for instance, stating "I left my jacket on the car" suggests it is resting on top rather than inside. Clarity in language is crucial to ensure that listeners understand the details about locations and actions accurately.
Preposition