Answer:
A
Explanation:
You didn't provide the excerpt but if it's the one I found online, I think A would make the most sense as the passage is primairly based around his own actions. If not A, then D would be second choice I think. 
 
        
                    
             
        
        
        
During the talent show, Marissa <span>C) -obviously embarrassed by her voice cracking- </span>ran off the stage in the middle of her song.
        
                    
             
        
        
        
Answer:
Wow, uh I would be vulnerable I guess. I would be really small and I could get stepped on. I guess there would be a lot of challenges.
Explanation:
I don't have anything with being small it has its benefits but it also has its downfalls. I don't know if I'd like to be that small.
 
        
             
        
        
        
Answer:
It seems like the teacher is the one who is late.
Explanation:
Misplaced modifiers are the modifiers that are misplaced or placed in such a way that they are far from the noun they intend to modify. In other words, modifiers placed away from the intended noun and seem like they are modifying another word are known as misplaced modifiers.
In the given sentence, the modifier "that was late" was intended for Keiko's project. But rather, it is placed next to the noun "teacher" making it seem like it is the teacher who's late. This is a case of a misplaced modifier.
Thus, the correct answer is the third option.