Answer:
A) Offering a line of surf boards
Step-by-step explanation:
If the company makes changes to how their products are made, e.g. different materials, colors, models, etc., they are not changing their corporate strategy, they are just modifying their product line. If they decide to start selling their swimsuits in a department store, they are increasing their outlets, that's all.
But when they decide to offer a very distinct product (a surfboard), then they are changing their corporate strategy from being just a clothing store to offering diverse products that can be used at a beach.