单项选择题

Questions 14-16 are based on the following monologue about making afire. You now have 15 seconds to read Questions 14-16. How was fire first made

A.Lightning hit a forest and started a fire.
B.People rubbed two pieces of wood together to make a fire.
C.People knock two pieces of stone together to make a fire.
D.People rubbed a stick between their hands to make a fire.