What is chromatography?
a. chromatography is the process of separating solutions by using a filter
b. chromatography is the process of separating solutions by using a selectively permeable membrane
c. chromatography is the process of separating solutions on the basis of their boiling points
d. chromatography is the process of separating solutions on the basis of their affinity to other materials

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.