the answer is B. Here is why: Gender schema theory was introduced by psychologist Sandra Bern in 1981. Bern’s theory was influenced by the cognitive revolution of the 1960s and 1970s as well as her desire to remedy what she believed to be shortcomings in the psychoanalytic and social learning theories of the time.
 
        
             
        
        
        
Answer:
The inventor initially struggled to solve the problem, but she discovered an ingenious solution.
Explanation:
I took the test on Edge.
 
        
             
        
        
        
Answer:Penalties typically include fines, imprisonment in county jail, or both. In addition, a person convicted of vandalism is frequently ordered to wash, repair or replace the damaged property (known as "restitution"), and/or participate in programs to clean up graffiti and other forms of vandalism.
Explanation:
 
        
                    
             
        
        
        
 The statement that has a prepositional phase here is:
Early pilots performed stunts
Explanation:
A prepositional phase is usually found in the beginning of the sentence. 
The use of the preposition is to draw out the meaning of a noun or a pronoun with respect to another object in the sentence. 
The common examples of such phases include Before, After, By, Under, Over and many other such examples which are there to accentuate a relation thus given.
Here, the use is simple.
The word Early is the prepositional phase which makes the connection between pilots and 'stunts' that is different from the one  made by the word 'performed' between them.