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Cognitive scientists argue that the ability to recognize oneself in a mirror—an ability limited to humans, apes, and perhaps to dolphins as well—is an indication of self-awareness.

A. the ability to recognize oneself in a mirror—an ability limited to humans, apes, and perhaps to dolphins as well—is an indication of
Parallelism error: The highlighted part is not parallel. should be either "humans, apes, and perhaps dolphins" or "to humans, to apes, and perhaps to dolphins"

B. the ability to recognize oneself in a mirror—an ability limited to humans, apes, and perhaps dolphins—is an indication of
The previous error is rectified here and hence it relays the intended meaning.

C. the ability to recognize themselves in a mirror—an ability limited to humans, apes, and perhaps to dolphins as well—is an indication for
Parallelism error: The highlighted part is not parallel. should be either "humans, apes, and perhaps dolphins" or "to humans, to apes, and perhaps to dolphins"
Intended meaning: "themselves" refers only to the scientists. However, it intends to convey this for every human, ape and dolphin.
Rhetorical: the usage of "as well" is rhetorical and hence the sentence is not concise


D. recognizing oneself in a mirror, as do humans, apes, and perhaps dolphins as well, is an indicator for
Intended meaning: recognizing oneself is not the indicator, the indicator is the ability to do so. Hence incorrect.
Rhetorical: the usage of "as well" is rhetorical and hence the sentence is not concise


E. recognition of oneself in a mirror—an ability limited to humans, apes, and dolphins perhaps—is used as an indicator for
Intended meaning: recognizing oneself is not the indicator, the indicator is the ability to do so. perhaps is used to convey the uncertainty of dolphins but here the placement of the word creates ambiguity. Hence incorrect.
Rhetorical: the usage of "as well" is rhetorical and hence the sentence is not concise


Hence the correct answer is B
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