(A) I might have arrived at work on time if I hadn¡¯t got caught in a traffic jam.
(B) You may arrive at work on time if you leave home early enough.

(C) I couldn¡¯t have arrived at work on time because I had got caught in a traffic jam.
(D) You can arrive at work on time if you leave home early enough, though I¡¯m not sure.

Is (A) equal to (C)?
Is (B) equal to (D)?