Which of the following sentences uses capitalization correctly?

Which of the following sentences uses capitalization correctly? (1 point)

a. I just read O. Henry’s short story “The gift of the Magi.”
b. I just read O. Henry’s short Story “The gift of the Magi.”
c. I just read O. Henry’s short story “The Gift of the Magi.”
d. I just read O. Henry’s short story “The Gift Of the Magi."