A local authority, acting under a statutory power to 'regulate and manage public parks', introduces a new byelaw prohibiting any political speeches within all parks in its jurisdiction. A pressure group that regularly holds peaceful rallies in one of the parks wishes to challenge the legality of this byelaw via judicial review. On which of the following grounds is their challenge most likely to succeed?
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A
Procedural impropriety, because the authority failed to consult the pressure group before enacting the byelaw.
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B
Illegality, because the byelaw is an unreasonable fetter on the authority's discretion and was made for an improper purpose.
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C
Irrationality, because no reasonable authority would ever impose a complete ban on political speech.
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D
Illegality, because the total ban goes beyond the power to 'regulate and manage' and is disproportionate, thus being an unlawful exercise of the statutory power.