The age of a tree is determined by counting the annual growth rings in its trunk, a method called dendrochronology.
- Each year, a tree forms a new ring due to seasonal growth variations, making it possible to estimate its age accurately.
- Height (B) and general appearance (C) are not reliable indicators of age since different species grow at different rates.
- Girth (D) (the circumference of the trunk) can indicate age to some extent but varies greatly depending on species and growth conditions.
Thus, option (A) Growth rings is correct.
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