Sorry, this is incorrect.
The correct answer is : The language of his own people
Ref: Surah Ibrahim 14: 4
وَمَآ أَرْسَلْنَا مِن رَّسُولٍ إِلَّا بِلِسَانِ قَوْمِهِۦ لِيُبَيِّنَ لَهُمْ ۖ فَيُضِلُّ ٱللَّهُ مَن يَشَآءُ وَيَهْدِى مَن يَشَآءُ ۚ وَهُوَ ٱلْعَزِيزُ ٱلْحَكِيمُ ٤
Translation:
We have not sent a messenger except in the language of his people to clarify ˹the message˺ for them. Then Allah leaves whoever He wills to stray and guides whoever He wills. And He is the Almighty, All-Wise.
Tafseer / Explanation:
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Allah always sent messengers speaking the native language of their people.
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This ensured that the message of truth was clear and understandable.
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Guidance is entirely in Allah’s control—He guides whom He wills.
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Similarly, He allows misguidance for those who reject truth, by His wisdom.
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Allah is All-Powerful and All-Wise in His decisions and actions.