An is a species that can act as either an acid or a base. aliphatic species allotropic species isomeric species amphiprotic species aromatic species

The correct answer for the above question is Amphiprotic species. 
Amphiprotic species are species that have both acidic and basic properties. A good example is an amino acid since it contains both a weak acid and a weak base functional group. Amphoteric oxides such as aluminium oxides can react with both acids and bases to produce salt and water are also examples. 

Ithink option a is correct because you cannot donate a different blood group than yours because it won't match.option a says betsy can donate to mark. they have the same blood group so donation can happen.