For smaller retailers and Web sites, which pay regular mail rates and may be shipping from only one location, free shipping is not nearly as affordable and often must be added into prices
A. which pay regular mail rates and may be
shipping from only one location, free shipping is not nearly as affordable and often must
B. that pay regular mail rates and may ship from only one location, free shipping is not nearly as affordable and often must
C. who pay regular mail rates and may ship from only one location, free shipping is not nearly
so affordable and it often must
D. which
pays regular mail rates and may ship from only one location, free shipping is not as nearly affordable and often must
E. which
pay regular mail rates and may ship from only one location, free shipping is not nearly as affordable and often must´
between B and E that and which is the difference but gmat will never ask question with the main difference to be which and that.