How should the error in sentence be corrected? the worstest harassment is expecting sexual favors in return for a raise or promotion.

a.
the worst harassment is expecting sexual favors in return for a raise or promotion.
b.
the worser harassment is expecting sexual favors in return for a raise or promotion.
c.
the worse harassment is expecting sexual favors in return for a raise or promotion.
d.
the most worst harassment is expecting sexual favors in return for a raise or promotion.