Question

how are all plants organized by scientists?
all plants fit into one phylum within the kingdom eukarya.
all plants make up an entire kingdom within the domain eukarya.
all of these are correct.
all plants make up the entire domain of eukarya.

Explanation:

In biological classification, domain Eukarya has kingdoms like Plantae (plants), Animalia (animals), Fungi, etc. Plants form an entire kingdom (Plantae) within domain Eukarya. They are not just one phylum (phylum is a lower - level taxonomic rank than kingdom) and domain Eukarya has multiple kingdoms (not just plants).

Answer:

All plants make up an entire kingdom within the domain Eukarya.