The inside measurements of a room are made from the:

The correct choice emphasizes the importance of measuring from the face of the finished walls. This practice provides a consistent and accurate reference point when determining the dimensions of a room. Finished walls include all the materials that contribute to the final appearance, such as drywall, paint, and any trim. By measuring from this point, builders and carpenters can ensure that the dimensions reflect the actual usable space within the room, accounting for materials that can impact the overall dimensions.

In contrast, measuring from the inside face of the rough studs may result in inaccuracies, as this measurement does not include the thickness of any finishing materials applied afterward. Similarly, measuring from the outside face of the rough studs does not accurately represent the interior space, as it does not take into account walls' interior finish. Therefore, measuring from the face of the finished walls is the most reliable approach for determining room dimensions in carpentry.