Answer:
B. Complex
Explanation:
The multicellular organism is complex as if it has millions of cells that when come together, it makes tissues which makes organs, and organs which comprises the organ systems which made up the organisms. You can say that it is simple neither uniform nor basic. As you see, we humans have a hard time understanding multicellular organisms because of their structure, so it can't be simple nor basic because of that structure. You can call it uniform as uniform means having the same form. Multicellular organisms don't always have the same form except they are in the same species. If we talk about single celled organisms it'll be basic either simple because of their structure.
That's all, thank you and have fun learning, especially science.