Backyard gardens seems a bit broad whereas the rest focus in on a certain subject relating to gardens.
        
             
        
        
        
Grandpa is lying in a hammock in the backyard.
B. lying  -  lie means to recline
lay - means to put down
Hope this helps.
 
        
                    
             
        
        
        
C. think about what they're
saying
        
                    
             
        
        
        
 
Hohokam
They were a type of ancient Native American people who lived in Arizona for a thousand years since year 1 AD.
 
 
        
                    
             
        
        
        
“I saw you at the practice run…”