OPTION A:- INCORRECT
This cannot serve as a conclusion to the statement because if the microwave cable service should remain an alternative rather than become a standard practice for non remote areas then it shouldn't be regulated by the government, besides its a long effects still remains unknown.
OPTION B:- INCORRECT
This option is based on a probability in the statement because we don not know if the micro wave cable service is actually dangerous or not. The statement also claims that the effect of the microwave still remains unknown, so it cant serve as as the best conclusion to the argument as a whole.
OPTION C:- INCORRECT
The argument isn't concerned with people's choice concerning laying of cables, so this cannot serve as a conclusion to the argument because it has deviated from the main concern of the argument.
OPTION D:- CORRECT
This is a suitable and the best conclusion because, the statement claims that microwave cable service is a good alternative for use in remote areas because it doesn't make use of cables and signal is sent through air, this shows that according to its recommendation, the microwave cable service is safe enough for use in remote areas.
OPTION E:- INCORRECT
The argument isn't concerned with the dangers microwaves can cause to either urban or suburban areas, so this cannot serve as a conclusion to the argument.