Correct Answer:
C. Sindh
The correct answer is Sindh. The 2023 census in Pakistan revealed that Sindh province recorded the largest population growth rate among all the provinces. While Punjab is the most populous province overall, and Khyber Pakhtunkhwa also experienced growth, Sindh's percentage increase in population was notably higher during the census period. This makes Sindh the correct answer for the largest population growth. Therefore, options A, B, and D are incorrect.