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Explanation:

All the options follow from the passage. But the one option and hence the answer which sums up options 1, 2 and 4 is option 3.
Because our real social life has dried up, our social life is shallow (option 1), lower middle class people cannot tolerate better off people (option 2) and upper classes resort to snobbery (option 4).
Also, the sentences in the passage does not indicate that the author is ‘poking fun’ at lower middle class people (option 2 can be eliminated). Additionally, the author explicitly states in the fifth paragraph that our real social life is drying up– “It is tragic, however, to observe that it is these very natural springs of social life which are drying up among us.”

Hence, the correct answer is option 3