Milwaukee's average high temperature for July is four degrees lower than that of Sioux Falls. Which of the following best explains the reason for this difference.
(A) - Michigan has a moderating effect on Milwaukee's temperatures.
(B) - Milwaukee is located near the Gulf Stream
(C) - Sioux Falls is in the path of most midlatitude cyclones.
(D) - Sioux Falls is located in the rain shadow of the Rocky Mountains.