The correct answer is option C, The narrator's platoon was surrounded by the enemy, similar to the way the narrator feels when he is surrounded by his family
Reason - 
In the story by Tim O’Brien’s, It is clear that the narrator is puzzled at two instances and at these two instances the word "Ambush" relate to its title The two instances are given below:
a)	The first instance is when the narrator’s daughter is asking him question about his war time memories. The narrator feels guilty when he lied to his daughter in order to be a hero in front of her but somewhere he was aware that he was lying.  
b)	The second instance is when the narrator threw a bomb and killed a soldier of another nation. He is guilty about killing anyone during wartime.  
 
        
             
        
        
        
...the results of natural and unnatural processes, and of interactions of the physical components of the planet on the environment.
plz mark me as brainliest :)
 
        
             
        
        
        
Amount of food in stomach when drinking, body weight, rate of consumption, strength of alcohol.
        
             
        
        
        
using seeds from the same source.
using the same kind of soil for both groups.
giving the control and experimental groups the same volume of water.
keeping the light the same for the experimental and control groups.
measuring plant height the same way and at the same time for both groups.