Which of the Following Was a Major Consequence of Achaemenid

Which of the following was a major consequence of Achaemenid rule?

A) Farsi became the dominant language throughout parts of Southwest Asia and the Indus valley.
B) Trading peoples such as the Phoenicians and Greeks were unable to compete with the trading power of the Achaemenids.
C) Communication greatly improved where the Achaemenids ruled, due to the construction of roads throughout the empire.
D) Cultural uniformity came to replace cultural diversity wherever the Achaemenids ruled.