Answer:
Most historians believe that Islam originated in Mecca and Medina at the start of the 7th century CE. Muslims regard Islam as a return to the original faith of the Abrahamic prophets, such as Adam, Noah, Abraham, Moses, David, Solomon, and Jesus, with the submission (Islām) to the will of God.
Independence from the British rule.
The third one , A new class of wealthy
Many people wanted to take over the empire and without the help of the armies there was no defense to protect the territories.
The Classical period did start in 1750 and ended in 1820, so those are both correct! However, the romantic period did not end in 1920 It ended in 1832.