16. In this passage, which of the following is TRUE?
(A) Milan has been ranked as the most polluted city in the EU.
(B) Milan has been working on finding solutions to solve the smog problem for years.
(C) Milan is the first city in the world offering incentive to citizens to solve the  smog problem.
(D)The French program of encouraging citizens to bike to work has brought great effect to lower the level of smog.