The correct answer would be C. to Humiliate someone, take away his or her dignity. 
 
        
                    
             
        
        
        
C. and grew to its mature form as a result of cell division 
        
                    
             
        
        
        
Yes we should opt for sustainable techniques while construction and developmental activites because-
- It is sustainable and long lasting.
 - Environement friendly. 
 - Cost effective in long run.
 - No harmful effect on humans.
 - Judicious use of available resource.
 
Explanation:
The world is undergoing an overarching danger of disastrous peril which would be strong enough to wipe out the last traces of human civilisation to its bequeathed end. To prevent such happenings, it becomes urgent that we employ sustainable techniques in construction and developmental activities.
These sustainable techniques are advantageous to humans at large due to the following benefits-
1.	It is sustainable and long-lasting- The process is sustainable and hence has a longer shelf life as compared to other processes. Due to its sustainable nature, the process has the least impact on other processes in its surrounding.
2.	Environment friendly- This is another important aspect of it. Sustainable techniques are distinct from others due to its environment-friendly nature.
3.	Cost-effective in long run-These techniques prove to be cost-effective in longer periods. Due to extended shelf time, the cost per unit time tends to be low.
4.	No harmful effect on humans-Sustainable techniques casts minimal to no impact on human, unlike erratic techniques.
5.	Judicious use of available resource-Sustainable techniques re judicious in the utilisation of the existing resources. They make the optimum utilisation of the resources thus enabling humans to enjoy the maximum potential use of the resources.
 
        
             
        
        
        
The correct answer to this open question is the following.
The three ecological regions of Nepal are the following: the Plains, teh Mountains, and the Hills. The social and economic aspects of these regions are the following.
Nepal is a multi-ethnic place and many languages are spoken in the country. 18% of the people are Chhetri, 14% are Brahmins, and 7% Magar.  80% of the population speak Indo-Aryan languages, while the rest 20% speak TibetanBirmese language. However, the official language of Nepal is called "Nepali."
Agriculture is the most important economic activity in Nepal, followed by the service sector, tourism, and the manufacturing industry.