سوال ۱۵ کنکور ارشد علوم کامپیوتر ۱۳۹۷

Cloze passage (Part B). Read the passage and choose the option that best fills blank (15).

Estimates of the number of humans that Earth can sustain have ranged in recent decades from fewer than a billion to more than a trillion. (11) ____, since "carrying capacity" is essentially a subjective term. It makes little sense to talk about carrying capacity in relationship to humans, (12) ____ and altering both their culture and their physical environment, (13) ____ can thus defy any formula (14) ____ the matter. The number of people that Earth can support depends on (15) ____, on what we want to consume, and on what we regard as a crowd.