In the following events, the certain event is~\uline{~~~~~~~~~~}~. 
Overseas Competition->Knowledge Point->Counting Modules->Statistics and Probability
$$\text{A}$$. Throw a coin randomly. It has a $$50\textbackslash\%$$ chance of landing head up and a $$50\textbackslash\%$$ chance of landing tail up.  $$\text{B}$$. Throw a die, and number of the dot shown may be any number from $$1$$ to $$6$$.  $$\text{C}$$. Sun sets in the west.  $$\text{D}$$. It may not rain in cloudy days.  So $$\text{C}$$ is the answer. 