A - United Shipping will aggressively advertise the new package of services.
Eliminate: If the price of services is lower elsewhere and customer have already moved to rival company, this strategy will not help.
B - United Shipping's rival does not offer some of the services included in the package.
Eliminate: The fact that customers have moved to rival company (see premise) suggest that they are getting the services they require from the rival company. So offering extra services alone (at higher prices) is not going to help United regain their customers back.
C - Marketing studies have shown that many of United Shipping's former customers would prefer a combined rate for their various shipping services.
Explanation: I have got to this answer choice by POE. I also took into consideration the fact that this is the only choice which mentions the price rate.
D - United Shipping does not already offer all the services separately.
Eliminate:
Does not mention the price hike factor.
E - No other shipping company offers the same package of services as United Shipping.
Eliminate: Explanation same as B.