There are 2 retail companies A and B with some financial information listed in the table below. One company is a supermarket, the other is a jewellery retailer. Distinguish which is company A and which is company B. Explain your choice.

\begin{tabular}{|l|c|c|} \hline & \multicolumn{2}{|c|}{ Company } \\ \hline & A & B \\ \hline Days' sales in receivables & 69 & 7 \\ \hline Net Profit Margin & 7.9% & 9.8% \\ \hline Book value per share & 0.1 & 0.28 \\ \hline Inventory turnover & 1.3 & 13 \\ \hline \end{tabular}