AP BIOLOGY

Atmospheric CO2 contains the naturally occurring stable carbon isotopes 12C and 13C in the proportion of 98.9% and 1.1%, respectively. Following are some of the statements regarding CO2 assimilation:A) Both C3 and C4 plants assimilate less 13CO2 than 12CO2.B) Both C3 and C4 plants assimilate less 12CO2 than 13CO2.C) C3 plants assimilate lesser 13CO2 than 12CO2 as compared to C4 plants.D) C4 plants assimilate lesser 13CO2 than 12CO2 as compared to C3 plants.Which one of the following combinations of above statements is true?