Which post runs between the front and rear doors on a four-door vehicle, or the door-handle-end post on a two-door car?

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

Answer: (B)

In vehicle body terminology, the vertical posts along the sides of the cabin are labeled from front to rear as A-, B-, C- (and sometimes D-) pillars. The post that sits between the front and rear doors on a four-door car is the B-pillar. On a two-door car, the same pillar is located at the rear edge of the front door where the door handle is, so it’s still the B-pillar. This pillar helps carry roof loads, supports the door and body structure, and provides mounting for the seat belts, contributing to overall crash safety and door alignment. So the described post is the B-pillar.