What Is the 4-Day Simple Moving Average as of Day

What is the 4-day simple moving average as of Day 7, given the following information?
$$\begin{array} { c c } \text { Day } & \text { Closing Price } \\1 & \$ 44.10 \\2 & \$ 44.14 \\3 & \$ 44.06 \\4 & \$ 44.61 \\5 & \$ 42.63 \\6 & \$ 42.65 \\7 & \$ 43.13\end{array}$$

A) $42.88
B) $43.13
C) $43.22
D) $43.31
E) $44.61