Typically How Old Can an Artifact Found in an Archeological

Typically how old can an artifact found in an archeological dig be and still allow you to use Carbon-14 dating to analyze its age? (¹⁴C, t_1/2 = 5730 years.) (If needed, use the following equations: )

A) 1 half-life
B) 2 half-lives
C) 4 half-lives
D) 5 half-lives
E) can use it to determine the age of anything.