how was singkil introduced after 14th century?

a. this was introduced by the mountain tribes in northern luzon such as those of the Kalinga and Ifugao people.

b. european cultural ideas spread and the filipinos adapted and blended to meet the local condition.

c. it was based on the epic legend of darangan of the maranao people in mindanao.

d. it was introduced by the malayan tribe ​