There are $$12$$ months. Thus, $$30\div 12=2R6$$ and hence $$2+1=3$$. 
Among $$30$$ children, there are at least~\uline{~~~~~~~~~~}~children born in the same month. 
A) $$1$$ 
B) $$2$$ 
C) $$3$$ 
D) $$4$$ 