Answer:
The preferable option will be - C. 
agreeableness, agreeable.
Explanation:
- A person who has an alternative character of <u>agreeableness</u> will typically follow a script, or a cascade of perceptual and behavioral strategy, that involves being warm, friendly, approachable, and slow to anger. 
- If a person is <u>agreeable</u>, then he or she will probably not get angry in response to a mild insult.
So, we can say that an agreeable person is more calmer than an agreeableness person.     
 
        
             
        
        
        
Particle size of soil and aeration capacity play important roles in plant growth
 
        
             
        
        
        
Skin is the Largest barrier agaisnt Pathogens which include Bacteria which cause infections.
        
             
        
        
        
It gets polluted from fertilizers or any spilled chemicals. And those chemicals get obsorbed into the ground. And the gravity pushes them deeper in the soil, till it reaches the underground water (or aquifer)
 
 
        
             
        
        
        
Answer: Ionic bond
Explanation: Ionic bond is a type of chemical bond which occurs by removing one or more electron from one atom and it is attached to another atom which gives a negative and positive ions that attract each other. For example Sodium chloride Nacl2.