The word “it” in paragraph I refers to _________.
any organic natural material
Correct answer: A
The word “it” in paragraph 1 refers to
A. carbon dating method.
C. any natural organic matter.
Are from “it” is the subject at the beginning of the sentence, so we read the whole sentence above: “Carbon dating can be used to estimate the age of any organic natural material; it has been successfully used in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields”
Carbon dating can be used to estimate the age of any natural organic matter, it is successfully used in the field of archeology to determine the age of artifacts, ancient fossils as well as in many other fields.
Based on the context of the sentence, “it” can only refer to “Carbon dating”.