contestada

Which sentence has correct punctuation and usage?
A.
Her idea was to drive from Phoenix, to Seattle but it was going to take too long.
B.
Her idea was to drive from Pho
enix to Seattle, but it was going to take to long.
C.
Her idea was to drive from Phoenix to Seattle but it was going to take to long.
D.
Her idea was to drive from Phoenix to Seattle, but it was going to take too long. please help I have test