Which of the following best compares rhizoids and fruiting bodies in fungi? a. fruiting bodies house rhizoids, which produce and release spores. b. rhizoids absorb water and nutrients, while fruiting bodies release spores. c. rhizoids function as stems, and fruiting bodies store water and nutrients. d. fruiting bodies break down food, and rhizoids house sporangia.

The correct answer is B. Rhizoids absorb water and nutrients, while fruiting bodies release spores.

Rhizoids of Fungi are similar to root hairs on vascular land plants. Rhizoids, release digestive enzymes and absorb digested organic material, so it is a feeding organ.  
Fruiting body or sporocarp is a structure that is part of the sexual phase of a fungal life cycle and it contains spore-producing structures.

That would be a working theory.