The correct answer is C. Qualcomm.
Cdma2000 1xEV is a 3G mobile telecommunications standard developed by Qualcomm. It is an evolution of the CDMA2000 standard, and it offers higher data rates and capacity than previous CDMA2000 standards. Cdma2000 1xEV was first deployed in 2003, and it is now widely used in North America, Europe, and Asia.
Motorola is an American multinational technology company that designs, manufactures, and markets a wide range of wireless communications products and services. AT&T Laboratories is the research and development arm of AT&T Inc. NTT is a Japanese multinational telecommunications company.
While Motorola, AT&T Laboratories, and NTT are all major players in the telecommunications industry, they did not develop Cdma2000 1xEV. Cdma2000 1xEV was developed by Qualcomm, a company that specializes in wireless communications technology.