I think it is A because they can just destroy it but D is finding something natural to kill it off but it is GM so it wouldn't help so A
        
             
        
        
        
Answer: Mental Labour, According to this definition, mental work refers to planning, organizing, coordinating, and managing duties and tasks that we perform during the course of our lives. People's worries about their ability to manage their time efficiently and effectively. 
Explanation:
I explained at the top-
 
        
             
        
        
        
Answer:
D and B
Explanation:
it is hard to explain but
Xylem is responsible for the transport of water and dissolved ions
The phloem is  made of companion cells that form to connect pipes