The correct option is
D Altrustic
We must choose the word that is NOT appropriate in the given context.
The word 'parsimonious' means 'very unwilling to spend money or use resources'. In this sentence, it means that 'the evidence was constructed using very scarce bits of information'.
The words 'penurious' and 'thrifty' are closely related to the given word:
'Penurious' means 'unwilling to spend money, mean', and 'thrifty' means 'using money and other resources carefully and not wastefully. These words are not inappropriate in the given context.
'Prevalent' means 'widespread or popular'. But, it is not inappropriate to the given sentence. Hence we don't choose options A, B and C.
The word 'altruistic' refers to 'selflessness'. It is most inappropriate in the given context. Hence we choose option D.