Answer:
c Accidentally
Explanation:
According to the sentence given, Christopher Columbus had limited knowledge of world geography and inaccurate navigational devices; and as a result of this, he was able to accidentally discover North America and all the available riches there.
The word "inadvertently" as used in the sentence means accidentally.
 
        
             
        
        
        
There is no bold portion in the sentence you gave 
I would add some kind of punctuation between you and said.
I will prepare an excellent meal for you. Said the cook.  
        
                    
             
        
        
        
Flooding is the main cause
        
             
        
        
        
Answer:
i believe the answer is c
 
        
             
        
        
        
A symbolic character represents a theme rather than an element of society