Answer: I think the correct answer is -Bailamos
        
                    
             
        
        
        
Number 4 as it’s the right one
        
             
        
        
        
Answer:
B.
Explanation:
Conozco means 'I know' Spanish is very different from English so it doesn't translate exactly but if it were, 'Yo lo se bien' it would be something like 'I know well' and when its 'Yo lo conozco bien' it means I know him well. That fits the contexts of the situation 
 
        
                    
             
        
        
        
Hoy no es domingo. Hope it helped.