Even within the same study, people responded quite differently to acupuncture, some showing increased flexibility, while others did not.

a some showing increased flexibility, while others did not.
b with some showing increased flexibility, while others did not.
c with some showing an increase in flexibility and others did not.
d some showing an increase in flexibility, while others not.
e with some showing increased flexibility and others not

Please someone help me with this. I am not able to proceed here.

THanks!