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Option 3 : 3
The correct answer is Option 3, i.e., 'refrain of unparliamentary language'.
Part 3 has an error because it uses an incorrect preposition.
The verb 'refrain' is always followed by the preposition 'from' and not 'of'.
The correct sentence will be 'It is expected of members of the House that they will refrain from unparliamentary language'.
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