Explanation

Abu Sufyan was a prominent figure associated with the Quraish and is historically linked to negotiations around this time. Suhail bin Amar's role in signing the treaty is not widely documented as the primary signatory for the Quraish. Utba did not sign the Treaty of Hudaibiya on behalf of the Quraish. None of these is incorrect because Abu Sufyan is the most likely historical figure associated with leading negotiations or representing a key faction during that period.