Which of the Following Was NOT a Major Turning Point

Which of the following was NOT a major turning point in Japanese history?

A) the start of settled,agricultural society in the 3rd century B.C.E.
B) the importation of many Chinese cultural practices in the 7th century C.E.
C) the arrival of Islam in the 9th century C.E.
D) the encounter with the industrial West in the 19th century C.E.