Are All Fungi Detrimental (Bad) for Other Organisms

Are all fungi detrimental (bad) for other organisms?

A) Yes-think of molds that destroy plant crops, or fungal infections that cause athlete's foot. All fungi are bad for organisms they colonize.
B) Yes-fungi feed directly on organic material. They usually kill the other organism and feed on it after it has died. As such, they are always bad for other organisms.
C) No-it depends on the fungus and the relationship it has with the other organism. Some fungi can form a symbiotic relationship with plant roots that increases their nutrient and water absorption. This is good.
D) No-fungi are ALWAYS good when they interact with other organisms. There is never a negative aspect to such interactions. Both sides always benefit from the relationship.
E) Yes-fungi are generally parasitic. Parasitic relationships always result in damage to the host organism while the parasite benefits from the association. As such, fungi are always bad for other organisms.