Kaplan CAT 1 - SC 3

jordan23 wrote:New, strong varieties of antibiotics show the potential to kill a harmful bacterium without the unintended effects of killing benign bacteria and development of resistant strains of bacteria by earlier high-strength varieties.

1) unintended effects of killing benign bacteria and the development of resistant strains of bacteria by earlier high-strength varieties - changes meaning; wordiness
2) unintended effects by earlier high-strength varieties of development of resistant strains and killing benign bacteria - parallelism issue.
3)unintended effects for the development of resistant strains of bacteria and killing benign bacteria of earlier high-strength varieties - - parallelism issue.
4) development of resistant strains of bacteria and killing of benign bacteria that were required by earlier high-strength varieties - gramatically fine but changes intended meaning.
5)killing of benign bacteria and development of resistant strains of bacteria, which were unintended effects of earlier high-strength varieties


I am having such a humongous trouble understanding the Kaplan CAT SC questions, one such Q is given above.
OA E

bubbliiiiiiii wrote:

jordan23 wrote:New, strong varieties of antibiotics show the potential to kill a harmful bacterium without the unintended effects of killing benign bacteria and development of resistant strains of bacteria by earlier high-strength varieties.

1) unintended effects of killing benign bacteria and the development of resistant strains of bacteria by earlier high-strength varieties - changes meaning; wordiness
2) unintended effects by earlier high-strength varieties of development of resistant strains and killing benign bacteria - parallelism issue.
3)unintended effects for the development of resistant strains of bacteria and killing benign bacteria of earlier high-strength varieties - - parallelism issue.
4) development of resistant strains of bacteria and killing of benign bacteria that were required by earlier high-strength varieties - gramatically fine but changes intended meaning.
5)killing of benign bacteria and development of resistant strains of bacteria, which were unintended effects of earlier high-strength varieties


I am having such a humongous trouble understanding the Kaplan CAT SC questions, one such Q is given above.
OA E

In (B), you have cited parallelism issue because Development and Killing are used, but this same parallel structure is used in E as well. Killing and Development, then why is E correct and not B?

scholardream wrote:Hi Jordan,
Could you please explain to me "Which" in E refer to what?
"Which" refers to "the killing of benign bacteria" or "development of resistant strains of bacteria" or Both?
I though "which" after the comma should ONLY refer to the NEAREST noun, in this case, "which" refers to only "development of resistant strains of bacteria"