Answer:
18. C. To inform about the history of Indonesian Heroes Day.
19. A. Surabaya
20. A. Brigadier Mallaby was killed.
Step-by-step explanation:
The attached text talks about the history behind Hari Pahlawan, or Heroes Day, celebrated by Indonesians on November 10. Heroes Day is held in memory of what took place during the battle of Surabaya, in 1945. Between 6,000 and 16,000 Indonesians were killed in a confrontation with British armies that lasted for three weeks, Brigadier Mallaby being killed near Jembatan Bridge. The text offers only general information about the battle, not going into too much detail, but letting us know enough to understand the existence of Heroes Day.