The correct option is
C Symbiotic fungi
Vesicular-arbuscular mycorrhiza (VAM) is formed by the symbiotic association between certain phycomycetous fungi and angiosperm roots. The fungus colonizes the root cortex forming a mycelial network and characteristics vesicles (bladder-like structures) and arbuscules (branched finger-like hyphae).So, option B is the correct option.