Using the symbols +, −, and 0 to indicate interspecific species interactions, where the first symbol refers to the first organism mentioned, which of the following claims/statements is correct?

A) +/0 will always remain such.
B) A +/− interaction could shift to +/0 or +/+ over time, depending on other factors such as competition, population density, or environmental changes.
C) Species interactions occur in isolation and cannot affect the structure of ecological communities.
D) A −/− interaction benefits both of the species in the relationship.