Final answer:
A nurse would choose the Lawton and Brody IADL scale (option C) to assess a client's ability to perform physical activities of daily living, as it evaluates the complex daily activities necessary for independence.
Step-by-step explanation:
The nurse would choose Lawton and Brody Instrumental Activities of Daily Living scale (option C) to assess a client's ability to perform physical activities of daily living. This tool is specifically designed to evaluate more complex daily activities necessary for independence, such as handling finances, managing transportation, and medication management. The Katz Index (option D) assesses basic activities of daily living, such as bathing, dressing, and toileting, but is less comprehensive in terms of instrumental activities compared to the Lawton and Brody scale. Although the OARS-IADL (option A) can also be used for similar purposes, the Lawton and Brody IADL scale is more commonly referenced and used in clinical settings. Therefore, when choosing a tool to assess a client's ability to perform instrumental activities of daily living, a nurse would opt for the Lawton and Brody IADL scale.