Given below are four jumbled sentences. Out of the given options, pick the one that gives their correct order.
A. To kill a whale, hunters used spears called harpoons.
B. Whale hunting is not easy.
C. These harpoons had very long and strong lines tied to them.
D. It was extremely difficult and risky before modern methods and machines began to be used.

A

BDAC

B

BADC

C

DBAC

D

DCBA