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Sentence Correction: Concise vs. Short & Redundant vs. Long

The moment one decides to follow a vegan or vegetarian diet, one should take the responsibility to become acquainted with the necessary information regarding B12 and other important vitamins and minerals and also have blood tests administered at regular intervals.

Incorrect.

This answer choice is grammatically incorrect: the pronoun they refers to one but does not agree with it as one is singular and they is plural.

The pronoun one agrees with itself only.

Example: One must be careful with what one wishes for.

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

[[snippet]]

Incorrect.

This answer choice is grammatically incorrect: The pronoun he can only refer to human male nouns, but there's no such noun in the sentence.

The pronoun one agrees with itself only.

Example: One must be careful with what one wishes for.

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

[[snippet]]

Incorrect.

Although this answer choice is grammatically correct, it makes a logical error: "one should be responsible" is awkward and vague - one should be responsible for what by becoming acquainted...?

Furthermore, the answer choice loses some of the meaning of the original sentence by changing the phrase B12 and other important vitamins and minerals to B12 and other vitamins.

Do not automatically choose the shortest answer choice. Make sure that shorter answers express the same meaning that's been stated in the original sentence. If they don't, they're probably incorrect.

[[snippet]]

Incorrect.

This answer choice is grammatically correct but stylistically flawed. Since the adjective periodic is similar in meaning to the phrase at regular intervals, using both in the same sentence creates redundancy.

[[snippet]]

Terrific work!

The pronoun one agrees with itself only and this answer choice is also the most concise of all.

one should take the responsibility to become acquainted with the necessary information regarding B12 and other important vitamins and minerals and also have blood tests administered at regular intervals
they should take the responsibility to become acquainted with the necessary information regarding B12 and other important vitamins and minerals and also have blood tests administered at regular intervals
one should take the responsibility to become acquainted with the necessary information with regards to B12 and other important vitamins and minerals and also have periodic blood tests administered at regular intervals
he should have blood tests administered at regular intervals and take the responsibility to become acquainted with the necessary information regarding B12 and other important vitamins and minerals
one should be responsible by becoming acquainted with the necessary information regarding B12 and other vitamins and have blood tests administered at regular intervals