Question:
It ultimately chose what it believed to be the least costly and least burdensome alternative.

Does it follow that "In the end, it chose what in its opinion was the least costly and burdensome choice."?
Answer:
yes

Question:
oh well have a good day then bye-bye

Does it follow that "Hope you have a good day."?
Answer:
yes

Question:
Obviously, there was a lot more to be covered in later courses.

Does it follow that "There are gonna be more courses and more will be covered."?
Answer:
yes

Question:
In the U.S., most human exposure to mercury is the result of consumption of fish contaminated with methylmercury.

Does it follow that "Residual mercury has been dumped into U.S. rivers and lakes, causing contamination."?
Answer:
it is not possible to tell