Official ExplanationThe Honeybee Conservancy said adequate biodiversity,
an ecosystem necessity that most biologists agree to be improved by honey bees in pollinating plants, will be endangered by the continued use of harmful pesticides on crops.
A) an ecosystem necessity that most biologists agree to be improved by honey bees in pollinating plants B) an ecosystem necessity most biologists agree that is improved by plants pollinated by honey beesC) an ecosystem necessity that most biologists agree is improved by honey bee pollination of plantsD) which most biologists agree on as an ecosystem necessity improved by honey bees who pollinate plantsE) which most biologists agree to be an ecosystem necessity improved by plants pollinated by honey beesAfter a quick glance over the options, there are a few key differences we can focus on:
1. “an ecosystem necessity” vs. “which most biologists agree on as/to be an ecosystem necessity” (Modifiers)
2. to be improved / that is improved / is improved / improved (Modifiers/Idioms)
3. in pollinating / pollinated / pollination / who pollinate / pollinated by (Verb/Meaning)This sentence deals with modifiers. Here we are looking for the intended meaning of the sentence and the clause that correctly modifies the noun “biodiversity.” For this question, we’re mainly dealing with #3 on our list. Differences are highlighted in the text.
A) an ecosystem necessity that most biologists agree to be improved by honey bees in pollinating plants This is
INCORRECT. It is unclear what the relationship is between honey bees and pollination and how they are connected to an ecosystem necessity. If we read the phrase “by honey bees in pollinating plants” literally, this is saying that biodiversity can only be improved by honey bees that exist INSIDE pollinating plants, which is NOT the intended meaning.
B) an ecosystem necessity most biologists agree that is improved by plants pollinated by honey beesThis is
INCORRECT. It is unclear what improves the ecosystem necessity—the plants and the fact they are pollinated, or the act of pollination itself? Also, the placement of the word “that” is problematic here - the fact that most biologists agree SHOULD be part of the “that” modifier. See option C to see how it should be done!
C) an ecosystem necessity that most biologists agree is improved by honey bee pollination of plantsThis is
CORRECT. This clearly explains the role of honey bees to pollination and how honey bees are connected to the improvement of an ecosystem necessity.
D) which most biologists agree on as an ecosystem necessity improved by honey bees who pollinate plantsThis is
INCORRECT. “Agree on” is not the correct idiomatic phrase. It’s also not a good idea to separate the modifier (an ecosystem necessity) from its antecedent (biodiversity).
E) which most biologists agree to be an ecosystem necessity improved by plants pollinated by honey beesThis is
INCORRECT. It is unclear what improves the ecosystem necessity—the plants and the fact they are pollinated or the act of pollination itself. This option also separates the modifier (an ecosystem necessity) from its antecedent (biodiversity), which is a big no-no on the GMAT!
There you have it - option C is the correct choice!Don’t study for the GMAT. Train for it.