Explanation:

Correct Answer is (c).In all other options except option C, the word given in the options are synonyms of those bold ones, only 'quashes' (to reject or put an end) is the one that is opposite of 'allows', which means "to permit or give permission".
New Sentence - Vistara world will introduce a live moving map display that quashes passengers to track their aircraft.
Hence option C is the correct answer.