Answer:
She should hang up a feeder of the old food next to the feeder of new food to test which one they really like more.
As far as I know, radioactive dating is the measure of radioactive substances in a fossil or something. Like the fossils have a radioactive substance in them, it is the only thing that can show how long the fossils been aging, therefore being able to show the date. And thats how radioactive dating works, and that is how a paleontologist uses it
Probably d but definitely not A though..
