In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic?

The organism which is single-celled, eukaryotic and photosynthetic, will be placed in Kingdom Protista.

As the organism is single-celled, so it can't be placed in Fungi, Plantae or Animalia because these kingdoms consist of multicellular organisms.

The organism can't be placed in Monera because this kingdom consist of prokaryotes but the given organism is eukaryotic, so it can be placed in Kingdom Protista.