Final answer:
Exxon and Coca-Cola offer the most diversification benefits.
Step-by-step explanation:
The pair of stocks that offers the most diversification benefits would be Exxon and Coca-Cola. Diversification is the strategy of investing in a variety of assets to reduce risk. By having stocks from different industries, such as energy (Exxon) and consumer goods (Coca-Cola), you are spreading your risk and increasing the likelihood that some stocks will perform well even if others don't.