Rearrange the parts of the sentence in correct order.
We have been
P. able to identify certain patterns in
Q. the microbiome and immune response
R. that are clearly linked to the progression and
S. severity of brain injury

Correct option is D

The proper arrangement is – ‘PQRS’.
 Statement P is in continuation of the phrase “We have been”.
 Statement Q is in continuation of the statement P, so will follow statement P next in order.
 Statement S is the concluding statement made amongst all the statements and hence will be the last in the order of the jumbled sentences.