Which reason does not make a case for the value of a proposed solution?

It is inexpensive.

It is easily implemented.

It creates potential new problems.

It is effective in solving the problem.

The reason that does not make a case for the value of proposed solution is that "it is effective in solving the problems." As always, the simplest explanation is the usually the best solution. This reasoning is lined with principle of plurality and the principle of parsimony.