I believe it’s b but correct me if I’m wrong
        
                    
             
        
        
        
Answer:
Explanation:
Grover gives Percy a present in a shoebox and  it's the horn that Percy snapped off of the head of the Minotaur.
Answered by the ONE & ONLY #QUEEN herself aka #DRIPPQUEENMO!!
HOPE THIS HELPED!!
 
        
             
        
        
        
B-Kidneys
The kidneys act as filters that strain urea and excess salts from the bloodstream to release them in the urine.