Explanation:

- The original sentence, "People was empty out of the malls and roads," is grammatically incorrect because 'was' does not agree with the plural noun 'People.'

- Option 1: "was emptying out of" is incorrect. 'Was' should not be used with the plural noun 'People.'

- Option 2: "were emptying of" is incorrect. The phrase should include 'out of' to fit the context appropriately.

- Option 3: "was emptying of" is incorrect for the same reasons as Option 1 and lacks 'out of.'

- Option 4: "were emptying out of" is correct. This option uses 'were,' agreeing with the plural noun 'People,' and 'out of' fits the context.

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