NEW YORK (AP) — PepsiCo is buying the energy drink maker Rockstar Energy Beverages for $3.85 billion. PepsiCo and Coca-Cola have moved aggressively in their pursuit of consumers that have a much wider variety of drinks to choose from than just years ago. The acquisition announced Wednesday expands PepsiCo's portfolio of energy drinks, which already includes Mountain Dew's Kickstart, GameFuel and AMP. The deal is targeted to close in the first half of the year.