First lets see if there is any parallelism trigger such as or,but, and (its the most common seen on the GMAT)
Researchers agreed that the study of new treatments for heart attack patients was extremely important
but [url]more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than[/url] the balloon procedure by itself.
As we could see from the above sentence their is the "
but" word.
Now we need to check the Stem of the sentence which is "
Researchers agreed" .
Lets construct the sentences before the parallelism trigger and after the parallelism trigger and compare:
Researchers agreed that the study of new treatments for heart attack patients was extremely importantResearchers agreed more research was needed to determine that balloon angioplasty preceded with ultrasound was or was not any better for heart attack patients than[/url] the balloon procedure by itself.The construction as you can see above is wrong since after the parallelism trigger "but" we expect
that which is not there. Hence A and B are out.
Now looking at the options D.
that more research was needed to
determine that balloon angioplasty
preceded with ultrasound was any better for heart attack patient than
Preceded with should be
Preceded by since
Preceded with does not make any sense in the sentence.
Also the meaning of the sentence is changed when we use
determine that.
We are left with option C and E now.
Lets check option E:
that more research was needed for determining that balloon angioplasty preceded by ultrasound is or is not any better for heart attack patients than is
To + Verb ==> talks about purpose or intent.
For + Verb-ing ==> talks about reason or "what for".As per the question
determine to is correct compare to
for determiningAlso the meaning of the sentence is changed when we use
determine that as in option D.
Hence we are left out with Option C.Hope the above explanation helps.
If your new to the whole parallelism concept or want to get a better picture of the following concept please refer to the below video link which i found immensely useful by
GMATNinja :
https://www.youtube.com/watch?v=vQgATaaw1ok