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Sentence Correction: Pronoun Questions - One

One should firstly analyze one's diet, who suffers from digestive problems, and secondly one's rate of physical activity.

This answer choice is illogical. The relative clause who suffers from digestive problems is intended to modify the noun oneIn this answer choice, however, it follows the noun diet, and a diet cannot suffer.

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

This answer choice is illogical and repeats the original Relative Clause error. The relative clause who suffers from digestive problems is intended to modify the noun one. In this answer choice, however, it follows the noun rate of physical activity.

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 it corrects the original Relative Clause error by placing the clause who suffers from digestive problems directly after the noun being described, this answer choice is grammatically incorrect. The pronoun their refers to one but does not agree with it as one is singular and their is plural.

The pronoun one agrees with itself only.

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

Every pronoun in the underlined part of the sentence or after it

Although it corrects the original Relative Clause error by placing the clause who suffers from digestive problems directly after the noun being described, this answer choice is grammatically incorrect. The pronoun his can refer to human male nouns, but there's no such noun in the sentence.

The pronoun one agrees with itself only.

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

Every pronoun in the underlined part of the sentence or after it

That is correct!

The relative clause who suffers from digestive problems should immediately follow the noun it modifies, namely, One.

should firstly analyze one's diet, who suffers from digestive problems, and secondly one's rate of physical activity
who suffers from digestive problems should firstly analyze one's diet and, secondly, one's rate of physical activity
who suffers from digestive problems should firstly analyze one's diet and secondly their rate of physical activity
should firstly analyze one's diet, and secondly one's rate of physical activity, who suffers from digestive problems
who suffers from digestive problems should firstly analyze his diet and secondly his rate of physical activity