Meena Offered to Sell a Widget to Thor for Use

Meena offered to sell a widget to Thor for use in his factory. He hesitated to accept that offer because he was not sure that the widget would be compatible with the rest of his equipment. The parties therefore agreed that Thor would take possession of the widget for the purpose of testing it at his factory. Which of the following statements is TRUE?

A) Risk will not pass to Thor unless he notifies Meena that he intends to keep the widget.
B) Risk will pass to Thor if he keeps the widget for an unreasonably long time, even if he does not intend to purchase it.
C) In this type of case, the issue of risk is irrelevant.
D) Since property follows possession, the risk passed to Thor as soon Meena gave the widget to him.
E) This transaction falls under Rule 5.