Answer:

Step-by-step explanation:
Here, we want to select a disadvantage of the power sources
The two listed are examples of renewable power sources with no level of pollution
However, in the case of wind, a wind turbine is needed and could only work in places where the wind is prevalent enough throughout the year. Likewise, hydroelectric power, can only work where we have a flowing water source
Thus, there is a bane of geographic and climatic restrictions serving as a disadvantage