1. C:  she would not go to the choral concert.
Her not going to the concert caused her to fail the course and not be allowed to re-take it. The F and the inability to retake the course would be the effect. 
2. False
Many events can have more than one cause and more than one effect. Effects, especially, can be high in number because one cause can set off a chain of events that affect a lot of different people. 
        
             
        
        
        
Where is the answer choices?
        
             
        
        
        
A. Helping verb, it describes the subject as it renames.
 
        
             
        
        
        
Structure
A text can basically be built/arranged/organized in one of five ways: Sequence, which is the structure that describes steps or a certain order. Problem/solution is the structure that covers a problem and a solution and focuses on the events that took place in order to reach the solution. Compare/contrast is the structure that compares the likenesses and contrasts the differences of things. Description is the structure that goes over the details of something. And, cause/effect is the structure that highlights how something caused something else to happen. 
Additionally, all five structures can be utilized within one of the four text types—narrative, expository, technical, and/or persuasive.