The diversity of species in a community refers to the ability to resist change number of individual organisms number of different species interactions of different species

Option C, number of different species

Explanation:

Diversity in simple terms refers to the variation in any set of things/organisms.  

Diversity in any sense has no relation with the “ability to resist change” as in some or the other way diversity provide scope to adapt changes and produce a stable environment or ecosystem.  Thus, option A is incorrect

Number of individual organism do not represents diversity, as diversity represents number of different organisms.  Thus, option B is incorrect

Interaction of different species is accompanied in an ecosystem which is directly proportional to the diversity with in an ecosystem (in maximum cases). The higher the diversity , the higher can be interaction among the species . Option D can be correct but considering the relevancy of the statement, option C is the better choice of answer

i am going to guess that it is co2.