To a perpendicular to the plane of ecliptic, the Earth's axis of rotation makes an angle of $23 \frac{1}{2}$ degrees. Had this angle been 0 degree, which one among the following would result?

• A

  There would have been no seasons
• B

  The length of day and night would have been the same throughout the year.
• C

  The length of day and night would have been the same all over the earth
• Correct answer
  D

  All of the above

Hence, the correct answer is option: 'D'.