I think the answer is b. D is what both the North and the South agreed to which was the 3/5ths compromise
It was "<span>2. Meriwether Lewis and William Clark" who famously </span>explored the Louisiana Territory in the early 1800s--a territory purchased by Thomas Jefferson from Napoleonic France for an incredibly small amount of money.
Research scientists used a standard practice called the scientific method to help them understand phenomena.
1) There would be a gradual withdrawal of American troops from South Vietnam.
2) The South Vietnamese would take greater responsibility for the fighting.