Sentence A - Only D suits the blank. E is grammatically incorrect. Since there is a possibility that hacking might take place, ‘unable’ is incorrect. Sentence B - ‘vulnerable’ may be correct at B. ‘suspicion’ is a noun and is not suitable at B. ‘unable’ is also incorrect. Sentence C - Here also, ‘vulnerable’ may be correct. ‘suspicion’ is still incorrect. ‘suspicious’ may have been correct as it is an adjective. ‘unable’ is also incorrect.
