Stefan purchased stock last year as follows:

Month	Shares	Total Cost
August	50	$ 5,000
October	70	$7,000
November	85	$8,500

In December of this year 2020, Stefan sells 75 shares for $10,000. Stefan cannot specifically identify the stock sold. The basis for the 75 shares sold is

A) $7,500.

B) $9,550.

C) $10,500.

D) $19,250.1