Question

the foxtail pine (pinus balfouriana) known as rcr 1, located in the united states, is one of the oldest known trees in the world, at 1,666 years old. with almost two millennia of climate data in its tree - single tree like this, claims dendrochronologist valerie trouet, can tell the history of the world. which choice completes the text so that it conforms to the conventions of standard english? a) rings and a b) rings, a c) rings. a d) rings; a

Explanation:

In English grammar, the correct phrase is "a ring" for a single - unit and "rings" for multiple units. The context here is about the tree rings of a single tree, so we need "rings, a" to correctly refer to multiple tree - rings and then a single tree.

Answer:

B. rings, a