Many countries share the view that drastic measures must be taken to stop

A. The pollution of the seas can only be prevented provided that many countries follow the same policy. 

B. By putting into practice a series of precaution it is generally believed that the pollution of the seas will be prevented. 

C. The sea will, it seems, continue to be polluted unless this agreement is accepted by a majority of the countries.

D. A lot of countries agree that it is essential to take strong action to put an end to the pollution of the sea.