A group which has mostly multicellular organismsGroup of answer choicesbacteriaArchaeaprotistsfungi

The group which has mostly multicellular organisms among the given options is fungi.

Here's why:

1. Bacteria: These are single-celled organisms and do not form multicellular structures. They belong to the group Prokaryotes.

2. Archaea: Similar to bacteria, these are also single-celled organisms. They are also part of the group Prokaryotes.

3. Protists: This group contains a mix of both single-celled and multicellular organisms. However, the majority are single-celled.

4. Fungi: This group is primarily composed of multicellular organisms, like mushrooms and molds. Some fungi can be unicellular like yeasts, but most are multicellular.

So, the answer is fungi.