If only and can

[efecevher]

If I ___ only get out of this bed for a while, then I ___ get fresh air-or just lean out the window-and see the street.
A) should / would
B) was able to / would
C) had to / would be able to
D) could / can
E) was able to / could

Hi friends. I couldn't figure out this question. What are your opinions, especilly about choice D?

Thanks in advance.

[RonBee]

could/could