Answer: I believe that the answer would be teamwork.
The correct answer should be the first option which is Allowing a foreign leader medical treatment in the United States led to a hostage crisis in Iran. The rest of the options are wrong.
Hope I helped!
Geologists have divided Earth's history into time units,
which are largely based on fossils.
Fossils<span> are the
preserved remains or traces of animals, plants, and other organisms from the
remote past.</span>
The correct answer between all
the choices given is the second choice or letter B. I am hoping that this
answer has satisfied your query and it will be able to help you in your
endeavor, and if you would like, feel free to ask another question.