This is a question with answer options. Goal: Tell when there was a drought by looking at a tree slice.

Which of the following methods is more reasonable for accomplishing this goal?

Available choices:
[A]. Look at the tree slice and look for the smaller rings. These years are when there was drought..
[B]. Look at the tree slice and look for the smaller rings that have no water. These years are when there was drought.....I think the answer is
[A].