The most important adaptive advantage associated with the filamentous nature of fungal mycelia is
a. the ability to form haustoria and parasitize other organisms.
b. the potential to inhabit almost all terrestrial habitats.
c. the increased chance of contact between mating types.
d. an extensive surface area well suited for invasive growth and absorptive nutrition.

d. an extensive surface area well suited for invasive growth and absorptive nutrition.

Explanation:

Fungi have an extracellular nutrition. These means enzymes are released to environment to start degrading macromolecules which can be later be absorbed (absorptive nutrition) through cell membranes. Having multiple spots (bigger surface area) through which it can nurture speeds up the rate at which it can grow leading to a faster growth and higher competition over resources.

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