Answer:
I remember thinking, Okay, I'll start with their hair, make it fall out strand by strand. They always left wearing kerchiefs to cover their bald patches.
Explanation:
"Magic realism" refers to a literary mode that focuses on contrasting elements. For example, a supernatural thing that is occurring in a realistic world. Such elements of fantasy, myths and the like interrupts the logic of realism.
Among the choices above, "I remember thinking, Okay, I'll start with their hair, make it fall out strand by strand. They always left wearing kerchiefs to cover their bald patches" shows magic realism in a sense that it is happening in the real world but is contrasted by the fact that the narrator is equipped with the capability to make the hair fall out. This was the time when the she remembers how her nannies in Cuba called her "a little witch."
So, this explains the answer.