When was the first national earth day

Earth Day was first celebrated in 1970. Peace activist, John McConnell proposed the day of March 21, 1970, the first day of spring, to honor the earth and the concept of peace. The date changed to April 22 that year and by 1990 it was taken internationally. Now more than 192 countries each year celebrate Earth Day.

im pretty sure the answer is b, i hope i < 3

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44