A moon rock has been sent to a lab for analysis. Which of the following would a chemist be least li?

When you have a multiple choice question, you almost always have one answer that is nonsense, one or two answers that clearly do not apply, and the remaining answer must be correct even if you don't understand why.

In this case, options a, c, and d are the only ones that a chemist has any training to study. Geologists study metamorphic change, not chemists. So b is the least likely.

You can pass almost any test with this method, just from what you learned reading magazines in waiting rooms.