It is implied in the passage that ____________.

Answer D.

The passage implies that …………

A. Carbon dating is not known outside of archaeology.

B. Fossils cannot be dated using carbon-14.

C. Carbon dating cannot be used on nitrogen-containing materials.

D. carbon-14 does not have the longest known half-life.

From Question 48, we infer that there is still another substance with a half-life longer than carbon-14 to determine the age of artifacts over 80,000 years old.