The correct options are
A Extreme weather conditions
B Over consumption of water
C Lack of infrastructure to access water
D Water pollution
Water scarcity is the non–availability of potable water. This may be due to extreme weather conditions (such as in deserts), over consumption (such as overpopulation in big cities), lack of infrastructure (such as canals, wells, pipelines etc.) that prevent access to water and pollution that makes water unfit for usage. Thus, all of the above options can create water scarcity.