Procter & Gamble has found through a life cycle assessment $($LCA$)$ of laundry detergents that the use $($with consumers$)$ stage of the life cycle has $($by far$)$ the highest energy consumption compared to other life cycle stages for this product. Which of the following actions by P&G would have the most beneficial impact in the environment?

A$.$ Sourcing laundry detergent raw materials from local suppliers

B$.$ Installing solar panels in the manufacturing facilities that manufacturers the laundry detergent

C$.$ Designing a laundry detergent package that is $10\%$ lighter.

D$.$ Designing a laundry detergent that is as efficient to be used with cold water as with hot water