Both Radiocarbon and Potassium-Argon Dating Share One Specific Problem That

Multiple Choice

Both radiocarbon and potassium-argon dating share one specific problem that makes these methods difficult to use.What is that problem?

A) Both have short half-lives.
B) Both have parents that are too rare to measure accurately.
C) The half-lives of both are poorly known.
D) Both produce daughters that are in a gaseous state.