PLEASE HELP!

Which evidence from the text shows how Gregor feels about the change in his father?

A. He became noticeably short of breath, even in his earlier life his lungs had not been very reliable.
B. He really ought to have expected things to have changed, but still, still, was that really his father?
C. He probably did not even know himself what he had in mind, but nonetheless lifted his feet unusually high.
D. That meant Gregor would now have to try to calm his father.