Cities and towns of developed countries are free from slums.
If the inference is ‘definitely true’, i.e., it properly follows from the statement of facts given.
If the inference is ‘probably true’ though not ‘definitely true’ in the light of the facts given.
If the ‘data is inadequate’ i.e. from the facts given you cannot say whether the inference is likely to be true or false.
If the inference is ‘definitely false’ i.e. it cannot possibly be drawn from the facts given or it contradicts the given facts.
If the ‘data is inadequate’ i.e. from the facts given you cannot say whether the inference is likely to be true or false.
There is no explanation about developed countries in the passage.