The answer is A, it brought back the civil service examination system.
Hope this helps :)
The Treaty of Tordesillas, in essence, divided trading and colonizing rights for all newly discovered lands of the world located between Portugal and Castile (later applied between the Spanish Crown and Portugal) to the exclusion of other European nations. So the only choice that would work here is A. It allowed Portugal to claim Brazil... Which you can see is true today because the Language that Brazil speaks today is nonother than Portuguese.
The Middle East is well known for having a vast extension of arid lands knows as the dessert. Therefore, there are few rivers that could be used for navigating purposes through this region. These included The Nile, the Tigris, and the Euphrates.
As a response to this logistical difficulty, Arab sailors developed sailoring techniques and navigational sciences like the sextant during the 10th century. It made it possible for sailors to navigate off the coasts as they no longer needed them as a reference.
As cotton became the backbone of the Southern economy, slavery drove impressive profits. The benefits of cotton produced by enslaved workers extended to industries beyond the South. In the North and Great Britain, cotton mills hummed, while the financial and shipping industries also saw gains.
