What are the two important attributes of a stable community ?

Resistance to invasions by alien species and resilience to disturbances

The two important attributes of a stable community are resistance to invasions by alien species and resilience to disturbances.

A stable community is one that is able to maintain its structure and function over time, even in the face of changes in the environment. A community that is resistant to invasions by alien species is less likely to be disrupted by the introduction of new species. A community that is resilient to disturbances is more likely to be able to recover from changes in the environment, such as fire, flood, or drought.

High productivity is not an important attribute of a stable community. In fact, a community that is too productive may be more vulnerable to disturbances. For example, a community of trees that is producing a lot of fruit may be more likely to be invaded by pests or diseases.

So the answer is (c).