A strongly supported claim in science should be regard

Answer 1

What are your choices?

Answer 2

correct, but something that can always be revised.
necessarily true.
meaningless but fun.
correct, and never needing revision.

Answer 3

Thank you.

Now which do you think is correct?

Answer 4

correct, but something that can always be revised? But can't find the exact answer in text, urrrg!