Interior footings (under columns, for example) are usually subject to which kinds of loads?

Interior footings, particularly those under columns, are primarily designed to support vertical loads. These loads are mainly the result of the weight of the structures above, which include walls, roofs, and any occupants or furniture inside the building. The purpose of the footing is to distribute these vertical loads effectively to the soil beneath, preventing excessive settling or shifting of the structure.

While it is true that footings might experience some horizontal forces due to factors like wind pressure or seismic activity, the primary design focus is on their ability to handle vertical loads. Therefore, categorizing them as almost purely vertical is correct, as their main function is to resist the static weight and dynamic loads applied from the building above.

The incorrect options focus on other types of loads that are not typically dominant in the context of interior footings. Horizontal loads and tension do play a role in structural engineering but don't apply as directly or predominantly to the load-bearing function of interior footings under column support.