Final answer:
The objective observation is c. Mrs. Smith's urine is cloudy and has a strong odour.
Step-by-step explanation:
The objective observation is c. Mrs. Smith's urine is cloudy and has a strong odour. Objective observations are those that can be directly observed and measured without any interpretation or bias. In this case, the observation of cloudy urine with a strong odour can be confirmed through clear visual inspection and is not based on subjective feelings or reports.