The correct answer is: D. No improvement
The sentence “The right to work implies the obligation on the part of the government to give a job to all the unemployed” is grammatically correct and makes sense. The word “all” is used correctly to refer to the entire group of unemployed people.
The other options are incorrect because they do not make sense in the context of the sentence. The word “any” would imply that the government only has to give a job to some of the unemployed people, while the word “every” would imply that the government has to give a job to every single unemployed person. The word “each” would also imply that the government has to give a job to every single unemployed person, but it would also sound awkward in the sentence.
Therefore, the correct answer is “No improvement.”