Which of the following activities is included in well drilling?

The activity of well drilling encompasses a comprehensive range of tasks, not limited solely to the act of creating new wells. It includes drilling or boring as well as all associated activities that are integral to the development and maintenance of water wells. These associated activities often comprise tasks such as setting casing, grouting, completion techniques, and even assessment of the well's yield and water quality.

This broader definition is critical because well drilling doesn't end once the well is created; it also involves ensuring that the well is correctly constructed, sealed, and equipped for operation. Understanding that drilling includes not just the initial borehole but also the necessary follow-up actions is essential for properly managing and utilizing a water well.

Other choices may seem somewhat relevant but they each imply a more limited scope. For example, focusing only on the construction of new wells overlooks the importance of maintenance and the various tasks involved in ensuring existing wells are functioning effectively. Likewise, emphasizing only casing placement ignores other essential procedures that are vital for creating a fully operational well. Therefore, the inclusion of all associated activities makes the correct answer the most comprehensive and accurate representation of well drilling practices.