Victor is an ecologist specializing in symbiotic relationships.
Victor was studying the symbiotic relationship between a species of beetles and the species of tree the beetle lived in. The beetle
obtained nectar and housing from the tree. At first, Victor believed the tree was neither helped nor harmed by the beetle, but then
Victor witnessed the beetles attacking herbivore insects that tried to feed on the tree
What relationship exists between the tree and the beetles?
A. Mutualism
B. Parasitism
C. Predation
D. Commensalism

Victor is an ecologist specializing in symbiotic relationships.  Victor was studying the symbiotic relationship between a species of beetles and the species of tree the beetle lived in. The beetle  obtained nectar and housing from the tree. At first, Victor believed the tree was neither helped nor harmed by the beetle, but then  Victor witnessed the beetles attacking herbivore insects that tried to feed on the tree . What relationship exists between the tree and the beetles?

The relationship that exist between the beetle and the tree is Commensalism

Explanation:

Commensalism entails relationship between two organism where one is benefiting and the other neither harmed nor gain

b is the best answer for this question.