Final answer:
Naheed's school was most likely closed for a whole week due to the COVID-19 pandemic.
Step-by-step explanation:
The reason why Naheed's school was closed for a whole week once the previous year could be due to various reasons. However, based on the given information, it is most likely that the closure was related to the COVID-19 pandemic.
In 2020-21, many schools around the world were closed due to the highly contagious nature of the virus. The lack of understanding about the virus and its impact on individuals made it necessary for schools to take precautionary measures, including temporary closures.
Naheed's school, like many others, might have closed as a preventive measure to minimize the risk of transmission of the virus among students and staff.