What Would the Following Proposition Be in Standard Form? Without

What would the following proposition be in standard form? Without distribution requirements, most students would take too narrow a range of courses.

A) If most students take too narrow a range of courses, then distribution requirements do not exist.
B) If distribution requirements did not exist, then most students would take too narrow a range of courses.
C) If distribution requirements did not exist, then most students would not take too narrow a range of courses.
D) If distribution requirements exist, then most students will not take too narrow a range of courses.
E) If distribution requirements exist, then most students will take too narrow a range of courses.