At the end of 2002, in Poland, 300 000 pupils left lower secondary education and at the beginning of 2003 250 000 new pupils started; there were 200 000 teachers in lower secondary education during those two years. How many pupils were there in lower secondary education in Poland at the start of 2003?

A. 2 600 000

B. 2 850 000

C. 2 550 000

D. 2 300 000