Given that it is a clear, cloudless, windless day in January in Oklahoma City, the expected trend for temperatures during the night is generally a decrease. In January, nights tend to be cooler than days, especially with no clouds to trap heat. Therefore, you can expect that the temperature later that night at 10 P.M. will be cooler than it was at noon.
The most appropriate answer is:
B. It will be cooler than 46°F.