Final answer:
Yonaty needed to demonstrate Mincolla's malicious intent to win his slander suit, as per the New York Times Co. v. Sullivan case, which requires proof of 'actual malice' in defamation cases involving public figures.
Step-by-step explanation:
Yonaty might have been able to win his slander suit against Mincolla if he had been able to show Mincolla's malicious intent. In defamation cases, particularly ones that involve public figures, the claimant must demonstrate that the defamatory statements were made with 'actual malice'. According to the precedent set by New York Times Co. v. Sullivan, this requires proof that the statements were made with knowledge of their falsity or with reckless disregard for the truth.
Answer: a) Mincolla's malicious intent