The sentences talk of human response to 'the victims' of any mishap. The verbs 'is' (sentences 1,2 and 4) and ‘are’ (sentence 5) in the simple present tense indicate these are all statements about what is normally true. Sentence 3 starts the discussion or discourse because it states that one should realise that the victims 'were' people and therefore it would be better to identify with their lives rather than discussing their deaths. It is followed by (5) which states why it is ethically or morally wrong to use the deaths. So, options (a), (b) and (e) are eliminated.Sentences (1) and (4) are linked in the same order as (1) says what is 'morally urgent while (4) warns of the 'moral danger'. This link is given only in option (c). (2) says what is easy and hence fits before (1) which specifies what is morally required or urgent.So the link is 3-5-2-1-4.