3. The half-life of carbon-14 is about 5600 years. A
fossil with 1/4 the normal
proportion of C, is
probably
years
old.

A. 2,800
B. 11,200
C. 22,400

It would be : B is your answer

The earth's inner core is the earth's innermost part. it is primarily a solid ball with a radius of about 1,220 km (760 miles), which is about 70% of the moon's radius.[1][2] it is composed of an iron–nickel alloy and some light elements. the temperature at the inner core's surface is approximately 5,700 k (5,430 °c), which is about the temperature at the surface of the sun.