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 This is because the moment before the creation of this technology presents a less technological period, with more outdated ideas.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.

a plantation economy is an economy based on agricultural mass production, usually of a few commodity crops grown on large farms called plantations. plantation economies rely on the export of cash crops as a source of income.

i hope this : )

the answer is definitley b!