Which answer corrects the shift in verb tense in the sentence?
Sheila's party begins at six, but the pizza arrived an hour after it was scheduled for delivery.
a. Sheila's party will begin at six, but the pizza arrives an hour after it was scheduled for delivery.
b. Sheila's party had begun at six, but the pizza arrives an hour after it was scheduled for delivery.
c. Sheila's party begins at six, but the pizza had arrived an hour after it was scheduled for delivery.
d. Sheila's party began at six, but the pizza arrived an hour after it was scheduled for delivery.