The Results of a Recent Poll on the Preference of Shoppers

Multiple Choice

The results of a recent poll on the preference of shoppers regarding two products are shown below. $$\begin{array} { l l l } \text { Product } & \text { Shoppers Surveyed } & \text { Shoppers Favoring } \\& & \text { This Product } \\\text { A } & 800 & 560 \\\text { B } &900 & 612\end{array}$$
The standard error of $\bar { p } _ { 1 }$ - $\bar { p } _ { 2 }$ is

A) .025.
B) .044.
C) .0225.
D) .68.