To a perpendicular to the plane of ecliptic, Earth’s axis of rotation

To a perpendicular to the plane of ecliptic, Earth’s axis of rotation makes an angle of 23½ degrees. Had this angle been zero degree, which one among the following would result ?
A) There would have been no season
B) The length of day and night would have been the same throughout the year
C) The length of the day and night would have been the same all over the earth
D) All of the above