Answer:
Plantae
Step-by-step explanation:
The multicellular, photosynthetic organisms with specialized tissues are classified in plantae kingdom of domain Eukarya. It is only plantae kingdom which has organisms with all of aforementioned characteristics. In other kingdoms of domain Eukarya, only one or two of these characteristics exist not all of them. For example, organisms in kingdom animalia have multicellular organisms with specialized tissues but they are not photosynthetic. The organisms of kingdom fungi are also multicellular like kingdom plantae organisms but they are also not photosynthetic, they are saprobic. Also, some of the organisms in kingdom protista may be photosynthetic but those organisms are not multicellular, they are unicellular.