Which one of the following represents an activity? A. Excavation for foundation B. Curing of concrete C. Setting of question paper D. All the above

The correct answer is D. All the above.

An activity is a task or action that is done or performed. Excavation for foundation, curing of concrete, and setting of question paper are all activities.

Excavation for foundation is the process of digging a hole in the ground to create a foundation for a building or other structure. Curing of concrete is the process of allowing concrete to harden and gain strength. Setting of question paper is the process of preparing and printing a question paper for an exam.

All of these activities are necessary to complete a task or achieve a goal.