Which development would best serve as a turning point between two historical periods?

An inventor creates a new technology that revolutionizes

Explanation:

When an inventor creates a technology that becomes something innovative, this moment serves as a turning point between two historical periods. This is because the moment before the creation of this technology presents a less technological period, with more outdated ideas. At the moment the inventor creates a revolutionary technology begins another historical period, a more technological period and with updated and renewed ideas.

polling is a process and the outcome is not involved in the process itself.

the outcome, which is an unfavorable rating for a particular candidate is not affected by the mechanical process of polling.

it rather depends on the number of people voting in favor of the candidate.

this is an outcome of people's preferences.

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."