Read Each Paragraph and Place [Brackets] Around the Topic

Short Answer

Read each paragraph and place [brackets] around the topic.
-Automobile side air bags are also available to protect occupants from side-impactcollisions, which account for 30% of all accidents.Side air bags must be engineered to deploy more quickly than those that protect from front-end collisions because a few inches of door separate the occupant from the colliding vehicle.Side air bags are mounted in the doors; in the roof - from which they deploy downward; and in seat backs -from which they deploy toward the door. Shipman, Todd, and Wilson, An Introduction to Physical Science, 11th edition