I would go with B .
Hope this helps yaa!
Temperate climate zone, because big cities don't function well during the arctic winter, nor summer actually
Answer:
Radioactive isotopes are unstable and will decay. ... The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope.
