Which tool can be used to transfer the width of the top view of a house to the side view?

The correct choice employs a 45-degree projection line, a compass, and dividers to accurately transfer the measurements from one view to another in architectural drafting. This method allows the designer to create the side view based on the top view dimensions, ensuring precision in the representation of the building's dimensions.

Using the 45-degree projection line technique helps in maintaining proportionality and scale when translating features from the top view to the side view. The compass can assist in accurately marking distances, while dividers ensure that measurements remain consistent and precise when transferred.

In contrast, while rulers and protractors are useful for measuring distances and angles, they do not facilitate the transfer of dimensions between two different views effectively. Grid paper and pencil can help in sketching, but they may lack the precision required to ensure accurate proportional representation. Drafting software can also be effective, but it might not suit traditional methods where manual transfer is required for drafting purposes. Therefore, the combination in the chosen option provides the most suitable tools for the task at hand.