The correct option is B. The rule is when one of the nouns connected by 'or' or 'nor' is plural then the verb must be plural and the plural subject should be placed next to the verb. Here, 'Surendra' is singular subject and 'his friends' is plural subject thus 'have been' is used which is plural verb. Hence, 'Have been' is the best fit according to the rule
        
             
        
        
        
B, they analyse any faults in the product to try and make a better final design which will then be built
        
                    
             
        
        
        
It depends if it's a single or a double bar line. 
if it's a double bar line it's just there to separate the sections of the music and if it's a single bar line all it does it separate the beats in order to make a measure.  
        
             
        
        
        
Answer:b
Explanation:because an ocean getting calmer is an expression or a form of personification
 
        
             
        
        
        
flats: Bflat Eflat Aflat
scale: Eflat F G Aflat Bflat C D Eflat