The Audubon Society and other conservation groups, concerned over what

Dear Friends,

Here is a detailed explanation to this question-

Concepts tested here: Tenses + Awkwardness/Redundancy

• The simple present tense is used to indicate actions taking place in the current time frame, indicate habitual actions, state universal truths, and convey information that is permanent in nature.
• The simple past tense is used to refer to actions that concluded in the past.
• The simple present continuous tense is used to refer to an action that is currently ongoing and continuous in nature.
• The present perfect tense (marked by the use of the helping verb “has/have”) is used to describe events that concluded in the past but continue to affect the present.
• “being” is only to be used when it is part of a noun phrase or represents the passive continuous verb tense; the use of passive continuous must be justified in the context.

A: This answer choice incorrectly uses the present perfect tense verb “have perceived” to refer to an action that takes place in the current time frame; remember, the simple present tense is used to refer to events that take place in the current time frame, and the present perfect tense (marked by the use of the helping verb “has/have”) is used to describe events that concluded in the past but continue to affect the present. Further, the sentence formed by Option A uses the passive and needlessly wordy phrase “to be the serious threatening of the environment as”, leading to awkwardness and redundancy.

B: This answer choice incorrectly uses the simple past tense verb “perceived” to refer to an action that takes place in the current time frame; remember, the simple present tense is used to refer to events that take place in the current time frame, and the simple past tense is used to refer to actions that concluded in the past. Further, the sentence formed by Option B uses the needlessly wordy phrase “as posed”, leading to awkwardness and redundancy.

C: This answer choice incorrectly uses the word “being”, leading to awkwardness and redundancy; remember, “being” is only to be used when it is part of a noun phrase or represents the passive continuous verb tense; the use of passive continuous must be justified in the context.

D: This answer choice incorrectly uses the simple present continuous tense verb “are perceiving” to refer to an action that takes place in the current time frame; remember, the simple present tense is used to refer to events that take place in the current time frame, and the simple present continuous tense is used to refer to an action that is currently ongoing and continuous in nature.

E: Correct. This answer choice correctly uses the simple present tense verb “perceive” to refer to an action that takes place in the current time frame. Further, the sentence formed by Option E is free of any awkwardness or redundancy.

Hence, E is the best answer choice.

To understand the concept of "Simple Tenses" on GMAT, you may want to watch the following video (~2 minutes):



To understand the concept of "Simple Continuous Tenses" on GMAT, you may want to watch the following video (~1 minute):



To understand the concept of "Present Perfect Tense" on GMAT, you may want to watch the following video (~2 minutes):



All the best!
Experts' Global Team