$1000\div 12=83R4$, $83+1=84$. 
There are $1000$ students in Grade $3$ in Think Academy. Among these $1000$ students, at least how many students were born in the month with the most births? 
  $$12$$ 
  $$82$$ 
  $$83$$ 
  $$84$$ 
  $$1000$$ 