1. A Since it is the mutualistic relationship between two populations, both will be benefitted. 2.C. Acacia trees that are left undisturbed. 3.There is no mutualistic relationship because only one organism has been shown to benefit from the relationship. 4. C. Acacia trees were fumigated to remove ants. Solution 1. A Since it is the mutualistic relationship between two populations, both will be benefitted. 2.C. Acacia trees that are left undisturbed. 3.There is no mutualistic relationship because only one organism has been shown to benefit from the relationship. 4. C. Acacia trees were fumigated to remove ants..