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Sentence Correction: Relative Clauses - Choosing the Correct Relative Pronoun

The German Shepherd Dog, which is a relatively new breed of dog, has the third highest amount of registrations in the United States.

This answer choice is grammatically incorrect. The article amount of can describe non-count nouns only whereas the noun registrations is a count noun.

What helps us identify this mistake is the following Stop Sign:

much, (a) little, less, the amount of

Although this answer choice corrects the original Parts of Speech error by using the article number with a count noun (registrations), it is grammatically incorrect. The relative pronoun who can describe humans only while the German Shepherd Dog is non-human

What helps us identify this question as a Relative Clause question as well as identify the mistake is the following Stop Sign:

who, which, that, whose, whom

Although this answer choice corrects the original Parts of Speech error by using the article number with a count noun (registrations), it is grammatically incorrect. The relative pronoun who can describe humans only while the German Shepherd Dog is non-human

What helps us identify this question as a Relative Clause question as well as identify the mistake is the following Stop Sign:

who, which, that, whose, whom

Although this answer choice corrects the original Parts of Speech error by using the article number with a count noun (registrations), it is stylistically flawed. The phrase has a number that is the third highest of registrations is awkward and redundant.

Great work!

This answer choice corrects the original Parts of Speech error by using the article number with a count noun (registrations).

which is a relatively new breed of dog, has the third highest amount
which is a relatively new breed of dog, has the third highest number
who is a relatively new breed of dog, has the third highest number
which is a relatively new breed of dog, has a number that is the third highest
who is a relatively new dog breed, has the third highest number