Carbon-14 dating would be useful in finding the age of

A.

a fossilized fish found in a layer of rock estimated to be between 15,000 and 25,000 years old.

B.

a fossilized spore estimated to be over 200,000 years old.

C.

a sedimentary rock with a leaf imprint of undetermined age.

D.

an index fossil known to have lived in the oceans 1 million years ago.

The correct answer is option A. "a fossilized fish found in a layer of rock estimated to be between 15,000 and 25,000 years old".

Explanation:

It is estimated that the oldest fossils that can be reliably measured using carbon-14 must be organic and have an age of around 50,000 years. Therefore, a fossilized fish found in a layer of rock estimated to be between 15,000 and 25,000 years old will fit perfectly to be dated using carbon-14. Anything older than 50,000 years old must be dated using other radiometric dating approaches.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.