Answer:
A) that build on their strengths relative to those of their competitors.
Explanation:
Positioning refers to the position of a company in a market place. It represents that how and why the product of a company is better from the competitor product. That could be in terms of quality, quantity, price, innovation, etc
So according to the given situation, the option A is most appropriate as it fits to the current situation
Hence, all other options are wrong