(A) Subscribers primarily choose the ad-free tier to avoid advertisements, not necessarily for exclusive content.
This proposal does not include the company's plan to opt out of advertising, as stated in the report above.
so, option A is not answer
(B) The availability of popular original content will be a decisive factor for many users when choosing between the ad-supported and ad-free tiers.
This proposal includes the company's plan that if ad-supported subscriptions lead to significant reductions in customer registrations, then there should be an ad-free customer registration service.
so, option B is answer
(C) The reduced cost of the ad-supported tier will not significantly increase the total number of subscribers to the streaming service.
This proposal cannot be included in the company's plan, as we are told in the above report that the advertising-supported customer registration service will reduce the number of customers.
so, option C is not answer
(D) Most current subscribers to the ad-supported tier do not consider the price difference between the two tiers to be prohibitively large.
This idea is not about the company's plan, but about the customer's perspective
so, option D is not answer
(E) Other streaming services do not offer their premium content to subscribers of their lower-priced, ad-supported plans.
This idea does not include the company's plans and the reasons above did not mention other streaming services
so, option E is not answer
Therefore the answer is B