Vineetk
In addition to relieving stress and building strength,
certain yoga poses instigate the onset of peristaltic pulses in the small intestine, just as peristaltic pumps do, and these have a purgative effect like a laxative’s.[A] certain yoga poses instigate the onset of peristaltic pulses in the small intestine, just as peristaltic pumps do, and these have a purgative effect like a laxative’s
[B] certain yoga poses instigate the onset of peristaltic pulses in the small intestine, like a peristaltic pump, and they have a purgative effect that is like a laxative
[C] certain yoga poses and peristaltic pumps both instigate the onset of peristaltic pulses in the small intestine, and they have a purgative effect like a laxative
[D] the onset of peristaltic pulses in the small intestine is instigated both by certain yoga poses and peristaltic pumps, and they have a purgative effect like a laxative’s
[E] the onset of peristaltic pulses in the small intestine is instigated by certain yoga poses, just as with peristaltic pumps, and these have a purgative effect like that of a laxative
First up, when you read the sentence, notice the use of 's at the end. Why? Because we are comparing 'purgative effect of peristaltic pulses' and 'purgative effect of a laxative' using 'like'. It is correctly used in the original sentence and my first thought is that they must have incorrectly compared 'purgative effect of peristaltic pulses' and 'a laxative' in some options. A quick look shows us that B and C are incorrect.
They end with 'a purgative effect that is like a laxative' and 'a purgative effect like a laxative'.
We are left with A, D and E.
D and E are incorrect because we are looking for the do-er of the actions 'relieving stress and building strength'. We need 'certain yoga poses' after the comma. D and E use 'the onset of peristaltic pulses' after the comma which doesn't make sense.
Look at an easier example:
In addition to cooking for the whole family, .......
What are you looking for after the comma? The person who cooks.
In addition to cooking for the whole family, the servant cleans the house and runs errands.
(A) is correct.