Question

in multicellular organisms, cells directly organize into...
tissues.
organ/body systems.
organisms.
organs.

Explanation:

In multicellular organisms, the hierarchical organization of cells starts with cells. Similar cells that perform a common function group together to form tissues. Organs are made of different tissues, organ systems are made of multiple organs, and the whole collection makes an organism. So cells directly organize into tissues.

Answer:

A. tissues.