"the broad-spectrum revolution was a significant event in human evolution because
a. it led to the extinction of the neandertals, who had survived by eating big-game animals
b. it marked the sudden advent of behavioral modernity
c. it brought about a new tool tradition based on flaked tools
d. it provided new environmental circumstances that made important sociocultural adaptations, like the development of plant cultivation, more likely
e. it made possible amhs' colonization of africa"

D) it provided new environmental circumstances that made important sociocultural adaptations, like the development of plant cultivation, more likely

Explanation:

 The broad-spectrum revolution are basically the hypothesis which provided the new environmental circumstances that made important sociocultural adaptation. This hypothesis basically explained the agriculture adoption and increased the development in the food production and plant cultivation. In the broad spectrum revolution the growth of plants and the animals become popular as there is increased in demand of food so the animal become scarce in search of food.

a is the final ! : )

the answer is d. amendments.