The Following Data Give the Dates of Successive Turning Points

Multiple Choice

The following data give the dates of successive turning points in U.S. economic activity and the corresponding levels of real GDP at the time.  
$$\begin{array} { | c | c | c | } \hline \text { Turning Paint } & \text { Date } & \text { Real GDP (1996 \$ billims) } \\\hline \text { (A) } & \text { July } 1953 & 1992.2 \\\hline \text { (B) } & \text { May } 1954 & 1941.0 \\\hline \text { (C) } & \text { Apr. } 1957 & 2182.7 \\\hline \text { (D) } & \text { Apr. } 1958 & 2117.4 \\\hline \text { (E) } & \text { Apr. } 1960 & 2391.0 \\\hline\end{array}$$  
Which of the turning points are troughs?

A) (A) , (B) , and (C)
B) (C) , (D) , and (E)
C) (A) , (C) , and (E)
D) (B) and (D)