Manero Company Included the Following Information in Its Annual Report

Manero Company included the following information in its annual report:
$\begin{array}{lrrr}&2014&2013&2012\\\text { Sales } & \$ 178,400 & \$ 162,500 & \$ 155,500 \\\text { Cost of goods sold } & 115,000 & 102,500 & 100,000 \\\text { Operating expenses } & 50,000 & 50,000 & 45,000 \\\text { Net income } & 13,400 & 10,000 & 10,500\end{array}$
-In a trend balance sheet,each balance sheet item is expressed as a percentage of

A) total assets.
B) the base year item.
C) sales.
D) equity.