Multiple choice

Which of the following sentences is grammatically correct?

  1. He is as well acquainted with the matter as I am.

  2. He advised his three sons to not quarrel between themselves.

  3. If I would have known this earlier, I would not have supported him.

  4. Of the two brothers, the eldest one is very quarrelsome.

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A Correct answer
Explanation

Corrections needed: ‘among’; ‘had known’; ‘elder’