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must x, y,z and most important of all must Q. Via parallelism must is applied to all arms. Hence, must x, must Y ... and most important of all must know-----

Between A and C runners are plural . Hence , C is correct
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Let’s try to simplify this sentence first:
Those who enter marathons …. learn that, to succeed …, runners must be (1) in excellent condition (2) have unshakable confidence, and … (3) know how to pace …

Here we see that items are in a list and so they must be parallel in structure.

Keeping this in mind, let’s look at the reflexive pronouns ‘yourself’ and ‘themselves’.
Looking at the simplified sentence we know that it is the runners who are learning these 3 things.
Therefore, you cannot use the singular reflexive pronoun ‘yourself’ to refer to the plural runners.

Using this logic, we can eliminate Options A, B, and D.

Option D adds the pronoun ‘they’ and changes the structure. Eliminate.

Option C is the best choice.

Hope this helps!
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CrackVerbalGMAT
Let’s try to simplify this sentence first:
Those who enter marathons …. learn that, to succeed …, runners must be (1) in excellent condition (2) have unshakable confidence, and … (3) know how to pace …

Here we see that items are in a list and so they must be parallel in structure.

Keeping this in mind, let’s look at the reflexive pronouns ‘yourself’ and ‘themselves’.
Looking at the simplified sentence we know that it is the runners who are learning these 3 things.
Therefore, you cannot use the singular reflexive pronoun ‘yourself’ to refer to the plural runners.

Using this logic, we can eliminate Options A, B, and D.

Option D adds the pronoun ‘they’ and changes the structure. Eliminate.

Option C is the best choice.

Hope this helps!

Hi,

Be in excellent condition ( is phrase)
Have unshakable....( Verb)
Know how to pace yourself ( phrase)
How are these three are parallel,two are phrase and one is verb

Please clarify the doubt

Thanks in advance!

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