If the Earth's Axial Tilt Were Perpendicular to the Plane

If the Earth's axial tilt were perpendicular to the plane of the ecliptic,the seasons on Earth would be

A) much more severe, with longer, colder winters and fiercely hot summers.
B) the same as they are now.
C) milder than now, with winters not as cold and summers not as hot as at present.
D) practically nonexistent.
E) a little more severe than at present, with winters a little colder and summers a little hotter.