问题

The old man said the accident happened ________ careless driving,so a large sum of money ________ be paid by the driver.[ ]
A: was due to; was due to
B: due to; was due to
C: is due to; has due to
D: is due to; was due to
B: due to; was due to
C: is due to; has due to
D: is due to; was due to
正确答案是: