The correct option is A influx
'Exodus' means 'a mass departure of people'.
Option A: In contrast, 'influx' means 'an arrival or entry of a large number of people'. It is the exact opposite of the given word.
Hence A is correct.
Option B: 'Home-coming' is 'an instance of returning home'. It isn't the exact opposite of 'exodus', as it means that someone left and returned back.
Option C: Similarly, 'return' means 'to come or go back to a place or person'. It can also mean 'to exit and go back', to return to one's country. Hence this isn't opposite to the given word.
Option D: 'Restoration' means 'to return something to one's former owner or to its original state'. This word isn't opposite to the given word.
Hence B, C and D are incorrect.