What did 100 countries agree to ban from dumping,under the London Dumping Convention of 1972? 

A)  highly toxic pollutants and high-level radioactive wastes in sanitary landfills 
B)  highly toxic pollutants and high-level radioactive wastes into space via missiles 
C)  highly toxic pollutants and high-level radioactive wastes in the open sea beyond boundaries of national jurisdiction 
D)  garbage and low-level radioactive waste in the open sea beyond boundaries of national jurisdiction

The London Dumping Convention of 1972 was an agreement signed by 100 countries to prohibit dumping highly toxic pollutants and high-level radioactive wastes in the open sea beyond the boundaries of national jurisdiction. Option A is incorrect as it mentions sanitary landfills, which are not related to dumping in the open sea. Option B is incorrect as the convention bans dumping into the sea, not into space via missiles. Option D is incorrect as it only mentions garbage and low-level radioactive waste, whereas the convention covers highly toxic pollutants and high-level radioactive wastes.