The correct answer is C. effective.
An efficacious remedy is one that is effective in treating a particular condition. In the context of the question, an efficacious remedy to unemployment would be one that is effective in reducing the number of unemployed people in a country.
The other options are not as accurate. Suitable means appropriate or fitting, but it does not necessarily mean effective. Possible means that something can be done, but it does not mean that it will be effective. Proper means correct or appropriate, but it does not necessarily mean effective.
There are
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