Which post is nearest the rear door handle on a four-door vehicle, or the rear roof post on a two-door vehicle?

• A. A-post
• B. B-post
• C. C-post
• D. D-post

Answer: (C)

Think of the car’s side structure in order from front to back. The post closest to the rear door is the rear post, which on most four-door cars sits right behind the rear door and up against the rear window; on a two-door, that same post becomes the rear roof pillar. This position is the one described—the post nearest the rear door handle in a four-door, and the post that forms the rear roof pillar in a two-door. That’s why this post is identified as the rear post (often called the C-pillar in standard labeling).