The kingdom might be considered a "grab bag" of organisms: unicellular, multicellular, autotrophic, heterotrophic.

The answer would be Kingdom Protista 

There is 6 kingdom in biology: Animalia, Plantae, Fungi, Protista, Bacteria, Archaebacteria. Kingdom Protista has a diverse kind because its member is the organism that could not be classified as Animalia, Plantae or Fungi.
Since the classification based on exclusion,  Protista member has less similarity than other kingdoms. That is the reason that protista called "grab bag" kingdom.

Ithink your answer will be c hope that’s you