坐在长途汽车里的乘客，以汽车为参照物，他是______的；以路旁电线杆为参照物时，他是______的．

—Excuse me, where is the nearest bookshop, please
—Sorry, I don't know.
—______.

A．You're welcome

B．Thank you all the same
C．I'm sorry to hear that

D．Thanks a lot