The number of red balls in the bag is the most compared with other coloured balls. If we take out one ball at random, the probability of taking out a red ball is larger. So $$\text{C}$$ is the answer. 
There are $$20$$ red balls, $$2$$ black balls, and $$1$$ white ball in a bag. They are of identical shape, size and quality except for colour. Take out $$1$$ ball without looking. Among the following statements, which one is true? 
[1] The ball taken out must be a black ball. 
[2] It is impossible that a white ball will be taken out. 
[3] It is very likely that a red ball will be taken out. 
[4] It is certain that a red ball will be taken out. 