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31 Aug 2019, 04:12
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Difficulty:
65%
(hard)
Question Stats:
45% (01:19) correct
55%
(01:25)
wrong
based on 312
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In a "smart home," home security systems, heating units, televisions, and washing machines are all networked, and the homeowner can send commands by phone to each appliance, which thereby activates or deactivates that unit as desired.
A. appliance, which thereby activates or deactivates
B. appliance, in turn activating or deactivating
C. appliance, and it will activate or deactivate
D. appliance and thereby activate or deactivate
E. appliance which, as a result, activates or deactivates
A. appliance, which thereby activates or deactivates
B. appliance, in turn activating or deactivating
C. appliance, and it will activate or deactivate
D. appliance and thereby activate or deactivate
E. appliance which, as a result, activates or deactivates
Source: GMAT Free
31 Aug 2019, 05:02
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In a "smart home," home security systems, heating units, televisions, and washing machines are all networked, and the homeowner can send commands by phone to each appliance, which thereby activates or deactivates that unit as desired.
A. appliance, which thereby activates or deactivates -which refers to immediate word that precede it and the comma, but it the command that activates or deactivates that particular unit and not the appliance itself. Also, singular activates and deactivates is used which refers to plural 'commands'.
B. appliance, in turn activating or deactivating - usage of 'in turn' and overall weird sentence
C. appliance, and it will activate or deactivate - 'it' refers to what? Commands? If yes, then 'it' must be plural, or does 'it' refers to appliance? Ambiguous and confusing.
D. appliance and thereby activate or deactivate -usage of 'thereby' is correct and moreover, the meaning of the sentence is maintained, unlike option A. Also, plural activate and deactivate used to refer plural 'commands'.
E. appliance which, as a result, activates or deactivates -Singular activates and deactivates is used which refers to plural 'commands', and the sentence is unnecessarily wordy.
IMO answer is option D
A. appliance, which thereby activates or deactivates -which refers to immediate word that precede it and the comma, but it the command that activates or deactivates that particular unit and not the appliance itself. Also, singular activates and deactivates is used which refers to plural 'commands'.
B. appliance, in turn activating or deactivating - usage of 'in turn' and overall weird sentence
C. appliance, and it will activate or deactivate - 'it' refers to what? Commands? If yes, then 'it' must be plural, or does 'it' refers to appliance? Ambiguous and confusing.
D. appliance and thereby activate or deactivate -usage of 'thereby' is correct and moreover, the meaning of the sentence is maintained, unlike option A. Also, plural activate and deactivate used to refer plural 'commands'.
E. appliance which, as a result, activates or deactivates -Singular activates and deactivates is used which refers to plural 'commands', and the sentence is unnecessarily wordy.
IMO answer is option D
02 Sep 2019, 05:57
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SajjadAhmad
Official Explanation
Creating a filter: the original sentence has an issue with the relative pronoun "which." It grammatically modifies "appliance," but that's not the intended meaning; the commands do the activating, not the appliance. Choice (A) is out. We'll look for an answer choice that corrects the error.
Applying the filter: choice (B) is defective because the phrase "in turn" indicates that the thing is shutting on and off according to some logic or sequence, whereas the intended meaning is on or off according to the each command. Choice (C) has a bad pronoun. Choice (D) uses the suspicious thereby but does so correctly. Choice (E) is defective because the verb "activates" is grammatically singular and meant to go with the grammatical subject "commands."
The correct answer is (D).
