I believe it's A....but I've never heard of B or D but if those two where a chose I'd chose B then....hope that helps
Answer:
By definition, the term change means a process by which something or an aspect of that process has undergone some kind of transformation or is different compared to the past.
One negative change someone may encounter as a student is that this student may be used to a specific teacher, his or her teaching techniques, way of testing,etc and one day without notice the school principal changes this teacher for one that would not produce the same impact or result on this student. This change will affect negatively on the student´s performance.
Explanation:
