2011 AMC 10B Problem 8

At a certain beach if it is at least 80^{\circ} F and sunny, then the beach will be crowded. On June 10 the beach was not crowded. What can be concluded about the weather conditions on June 10?

\textbf{(A)}\ \text{The temperature was cooler than } 80^{\circ} \text{F and it was not sunny.}

\textbf{(B)}\ \text{The temperature was cooler than } 80^{\circ} \text{F or it was not sunny.}

\textbf{(C)}\ \text{If the temperature was at least } 80^{\circ} \text{F, then it was sunny.}

\textbf{(D)}\ \text{If the temperature was cooler than } 80^{\circ} \text{F, then it was sunny.}

\textbf{(E)}\ \text{If the temperature was cooler than } 80^{\circ} \text{F, then it was not sunny.}

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.