Advertisement-free radio broadcasting is a non-excludable public good. The following table shows the private marginal benefits of each of 10,000 residents in a rural county as well as the social marginal benefits from hours of ad-free broadcasting per day.

Hours per day	Private MB	Social MB
6	$7	$70,000
8	$6	$60,000
10	$5	$50,000
12	$4	$40,000

Each hour of broadcasting costs $50,000. The market outcome would be ________ hours of ad-free broadcasting each day. The efficient quantity is ______ hours of ad-free broadcasting each day.

Select one:

A.0; 0

B.0; 10

C.6; 12

D.10; 0

E.10; 10