Explanation:

Correct Answer is (b).The original sentence is erroneous.
Reason: Usage of the phrasal verb 'get away' which means ‘escape' is inappropriate in this sentence.
'Get about' which means ‘get around’ would be suitable in this context. If news or information gets about, a lot of people hear about it.
E.g.: Somehow it got about that Jenny was having a baby.
Hence ‘gets about’ should be used in place of ‘gets away’ to make the sentence grammatically and contextually correct.
Among the given choices, only option B replaces the given bold part most appropriately.
The sentence after replacement becomes:
Much of the religious tension in the country is due to fake news that gets about via social media.Option B is hence the correct answer.