A、The plane which is flying in sky. B、The weather that looks to be affected. C、The airport that seems to be affected. D、The mana

W: Look up at the sky, isn’t it terrible? Do you think it’s safe?
M: If the planes are still flying, I’m sure it’s safe. They never fly when they know there’s any danger.
W: Perhaps we ought to phone the airport.
M: Jane’s already done that.
W: What was she told?
M: There have been no cancellations and no delays yet.
W: Yet? What does that mean?
M: The planes have been taking off on time but if the bad weather continues some delays are expected.