Answer:
Plantae
Step-by-step explanation:
Fungi are NOT autotrophs, so it is not fungi
Archaebacteria aren't multicellular, so it's not archaebacteria
Animalia aren't producers, so it's not Animalia
Eubacteria aren't multicellular, so it's not eubacteria
Plantae is the only one on here that has all of the characteristics