In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
Comprehension:
Humans have (1)________ that animals do not have a life and maybe exploited in any way they see fit, but this (2)________ is incorrect and must be altered before it is too late. We fail to recognise that the pain we (3)________ on animals will come back to haunt us, and no matter how (4)_______ the discovery we make by causing harm to animals, it will be futile. It can never (5)_________ the human actions.
Select the most appropriate option to fill in blank number 5.