The organs of pigs genetically modified by human stem-cells are now vi

I would like to add my 2 cents…

This sentence hinges around the use of indefinite pronoun v/s definite pronoun.

Per my logic, subject “human” is stated explicitly, which would then require a definite pronoun. Indefinite pronouns like oneself, one, etc. come in handy in the absence of a clear subject, or while making generalizations involving no explicit subject in the sentence. To elaborate this concept, a sentence that read as follows would be correct.

The organs of pigs genetically modified by human stem-cells are now viewed as forms of health insurance and as resources a human is able to use to take care of himself/herself in later illnesses.
OR
The organs of pigs genetically modified by human stem-cells are now viewed as forms of health insurance and as resources one (no clear subject, mind you 'one' is an INDEFINITE pronoun which has no clear antecedent ) is able to use to take care of oneself in later illnesses.


This rules out A, B and C.

Between options D and E, D fails to reinforce the intended meaning of the sentence that humans are able to take care of themselves. In grammatical terms, “them” in D may not refer to humans at all. It may refer to other objects like animals or pets of humans. In order to make the humans direct object of their action of taking care, a reflexive pronoun would be most appropriate that emphasizes the fact that the doer (human) is ultimately the receiver of the action. Hence, E is the correct answer.