Final answer:
Increased barking is not a common problem in older cats because cats do not bark. Instead, older cats may experience issues such as arthritis, dental problems, and cognitive dysfunction.
Step-by-step explanation:
The common problems associated with an older cat do not include increased barking, as this is not a behavior typical of felines. Cats do not bark; this is a behavior observed in dogs. Hence, the correct answer is c) Increased barking. Older cats often face several health issues as they age. These issues can include a) Arthritis, which is characterized by joint pain and difficulty in movement; b) Dental issues, which can cause pain and difficulty eating; and d) Cognitive dysfunction, which can manifest as balance and posture problems, difficulty with planning and executing tasks, poor judgment, repetitive motor behaviors, as well as changes in personality.