The longest of the empires was be ottoman
The correct answer here would be C.
Gregor Mendel was an Austrian priest, mathematician and most importantly a botanist. He is considered to be the father of classical genetics. He was among the first people to find about the dominant and recessive traits that are passed randomly from the parents to the offspring.
He was associated with the signing of the Declaration of Independence. Was known for his large Signature.
When Europeans arrived in the 1500s, an estimated 5 million people were living under Aztec. They formed a mighty empire by conquering adjacent cities. And they also controlled trade in the region and demanded tribute or payment from the cities they conquered.