Rhizopus is a saprobic fungus which feeds on the dead decaying organic matter. Its body is made up of branching mycelia composed of three types of hyphae- rhizoids, stolons and unbranched sporangiophores. Rhizoids are root like hyphae that grow downward into the soil and help in absorption of water. A stolon is a special slender horizontal hyphae that help in the propagation of an organism. Sporangiophores are straight, unbranched tubular thread like hyphae which bear rounded sporangia at its tips. sporangia produce non-motile multinucleate spores for asexual reproduction. Thus, the correct answer is option B.