If You Were Faced with the Choice of Eliminating All

If you were faced with the choice of eliminating all mutualistic symbioses involving plants and other organisms (besides humans) , with the goal being to preserve the most plant biomass, which of the following would you save from elimination?

A) the dispersal of seeds in or on animals
B) the dispersal of male gametophytes by animals
C) plants harbouring nitrogen-fixing bacteria
D) associations between soil fungi and roots or rhizoids