The first alternative is correct (A).
The change in the location of firms occurs in the context of productive globalization, when the multinationals sought to move their factories to countries where the cost of production was lower. If the company can lower the cost of production, it is possible to sell the product at a lower price and become more competitive. This is what happens when a factory decides to move its US factory to Pakistan. In that country labor is cheaper than in the US, so the company uses this opportunity to reduce costs and improve its competitiveness in the world market.