Simile because it uses like and as to describe something
This is what I searched up in google. You can put it in your own words if you want to.
There is no need of comma in this sentence because there are only 2 objects in this sentence which were separated by and ok....
It's that one person in you're class who's always funny or trying to be
Hello!
The option that would best fit this situation would most likely be option four, "The oxygen bottles provide an added level of security for Hillary and Tenzing that they will have oxygen available for their descent."
Hope this helps, and have a great day! x