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?

Installing solar panels in the manufacturing facilities that manufacturers the laundry detergent

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

Sourcing laundry detergent raw materials from local suppliers

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