The sentence that uses a colon correctly is:
- Rose and her friends played: Bridge, Canasta, Poker, and Rummy
<h3>What is the correct use of the colon?</h3>
When writers wish to introduce a list, a proper symbol they can use is the colon. In the sentence above, the purpose of the colon can be seen clearly. Here we can see a list of the names of four kinds of games Rose and her friends engaged in. 
A reader can thus see the names of the games and identify them with ease. There are other uses of the colon. The colon can be used in headlines to differentiate different parts of the sentence. 
The colon can also be used in dialogues between two or more persons. Another use of the colon is that of emphasizing the main point.
For the text provided above, option A accurately describes a function of the colon.
Learn more about the colon here:
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A source of conflict that I am aware of in American culture now is  Racism It is a social conflict it is a modern issue And to resolve the conflict i say we as a people should unite and treat each other equally how long might that take who knows i say it will take a while but I believe it can be done.
 
        
             
        
        
        
It is 4. because it says in the paragraph and I quote: "helium has a very low density. it is used in daily weather balloons to carry instruments that record, tempature, humidy, and pressure readings in the atmosphere.
        
             
        
        
        
C growth :) hope this helps