Using the Same Information as Above and Assuming Marginal Cost

Using the same information as above and assuming marginal cost is negligible,what is(are) the profit maximizing price(s) ?

A) Charge $300 to EMBA and $100 to MBA
B) Charge either $300 or $100 (the publisher is indifferent)
C) Charge a uniform price of $300
D) Charge a uniform price of $100