What is the limiting reactant in a chemical reaction? A. the reactants that runs out first

B. the product formed first

C. the reactant that slows the rate of reaction

D. the product formed in smallest quantity

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.