The answer to this question is b 65%
"An explanation of why social media messages that are not extreme are sometimes ineffective".
"A quotation from an expert on why postings without religious elements work in the short term".
In this he was trying to say about how some messages online will not e effective specially if they are aggressive.
In the second one, messages with religious content can attract people in the Middle East.
This is not answerable as there is no article attached.
A trade union protests their employers for better or improved working conditions, sometimes through strikes, picketing, etc.
Review by the US Supreme Court of the constitutional validity of a legislative act.
(in the UK) a procedure by which a court can review an administrative action by a public body and (in England) secure a declaration, order, or award.
