Atlas Door Tightly Controlled Logistics So That It Always Shipped

Multiple Choice

Atlas Door tightly controlled logistics so that it always shipped only fully complete orders to construction sites. In regards to the five forces model, which of the following is a reason this might give them competitive advantage?

A) It helps to reduce the threat of new entrants.
B) It created low entry barriers for new entrants.
C) It created a high threat of substitution.
D) It gave more power to buyers.