Which of the following building components keeps opposite walls from spreading apart? rafters purlins ceiling joists trimmer studs

## Step 1<br />The question is asking about the building component that prevents opposite walls from spreading apart. The options provided are rafters, purlins, ceiling joists, and trimmer studs.<br /><br />## Step 2<br />Let's understand what each of these components does in a building structure:<br /><br />- Rafters: These are the sloping beams that form the roof of a building.<br />- Purlins: These are horizontal beams that provide support to the roof.<br />- Ceiling joists: These are the horizontal framing members that support the ceiling.<br />- Trimmer studs: These are the vertical framing members that provide support to the walls.<br /><br />## Step 3<br />Among these options, trimmer studs are the components that prevent opposite walls from spreading apart. They are the vertical framing members that provide support to the walls, ensuring that the walls remain in place and do not spread apart.