(A) "In order to use existing telephone wire, telephone companies would need to modernize their operations, a process so expensive it would virtually wipe out all profit from their monopoly for the foreseeable future." - This option directly addresses the cable companies' fear. If the telephone companies have to spend a significant amount of money to modernize their operations before they can offer cable services, the high cost of modernization would offset the profits they make from their phone service monopoly. As a result, they wouldn't be able to subsidize their cable service with profits from their phone service. This would eliminate the unfair competitive advantage, thereby easing the cable companies' fear.
(D) "Cable programming that offers more channels is already available through satellite dish, but the initial cost of the dish is extremely high." - This statement discusses an alternative to cable but doesn't directly address the fear of unfair competition between telephone and cable companies. It doesn't impact the cable companies' concern about subsidies.
(E) "Cable television will never be able to compete with the burgeoning video rental industry, especially as more homes now have video cassette recorders than ever did before." - This statement discusses competition with the video rental industry, which is unrelated to the specific issue of telephone companies entering the cable service market. It doesn't address the fear of unfair competition between telephone and cable companies.
(A) is the correct answer because it directly mitigates the cable companies' concern about unfair competition by showing that the telephone companies wouldn't have the excess profits from their phone service monopoly to subsidize their cable services due to the high costs of modernization.