By 1970,few Households in the United States Had Cable Television

By 1970,few households in the United States had cable television but two developments would lead to a substantial increase in the growth of the cable television industry.One of these developments was satellite relay technology that made it feasible for local systems to receive signals from distant broadcast stations.What was the second development?

A) the introduction of Home Box Office (HBO) and other premium cable channels
B) The U.S.Congress relaxed restrictions on rebroadcasting distant stations and premium channels.
C) Ted Turner purchased WTBS,which became the first cable "superstation."
D) The U.S.Congress granted an antitrust exemption that enabled cable stations to merge.As a result,several "superstations" were able to take advantage of economies of scale to lower their average costs and prices.