Answer:
There were four classmates left when Miep met Anne's teacher.
Step-by-step explanation:
Anne Frank was a German-Dutch Jewish girl who was a victim of Holocaust. She is well recognized for her memoir titled "The Diary of A Young Girl" which was produced posthumously.
Ronald Wilfred Jansen wrote a book titled "Anne Frank Silent Witnesses" that further sheds a light on the life of Anne Frank. In his book, he wrote the account of those people with whom Anne was associated.
When Miep, one of the helper of Secret Annex, met Anne's teacher in the school, there were four classmates left there.
So, the correct answer is four classmates.