The Signaling Factors of Arbuscular Mycorrhizae Most Likely Gave Rise

Multiple Choice

The signaling factors of arbuscular mycorrhizae most likely gave rise to the signaling factors used in rhizobial nodule formation, yet less is known about arbuscular mycorrhizae because

A) they cannot be maintained in pure culture.
B) they are not as important for plant health.
C) no genetic systems have been developed for fungi.
D) they are not as important for plant health and no genetic systems have been developed for fungi.