The correct answer is: B. Newel posts
Newel posts are vertical posts placed at the top and bottom ends of a flight of stairs, or at the corners of a landing. They support the handrail and provide a sturdy base for the staircase.
Balusters are the vertical pieces that support the handrail, and a balustrade is a railing made up of balusters. Railings are any type of barrier that is used to prevent people from falling, such as those found on balconies or staircases.
Here is a diagram of a typical staircase, with the newel posts labeled:
Newel posts are typically made of wood, metal, or stone, and they can be either round or square in shape. They are often decorated with carvings or other embellishments.
Newel posts are an important part of any staircase, as they provide support and stability. They also add to the overall aesthetic of the staircase.