piano sonata D Major

This is a 5 part rondo. Since everybody seems to like my outline format, I guess I will just use it again!

A:
-Lasts from measure 1 to measure 20
-Begins in the key of D Major
-Begins very softly and slowly moves from p to f.
-This is a rounded binary form. The b of A is in the dominant key, A Major.
-Ends in tonic key, D Major.

B:
-Lasts from measure 21 to measure 40.
-Tonality shifts to the parallel minor.
-Another rounded binary form!

C:
-Key changes to G Major... and many other keys. What the heck is going on here?
-Tempo changes a bit with the use of fast 16th note figures
-rounded binary, AGAIN.