Muhammed (SAW) was given the title of Amin because of his
Patience
Humility
trustworthy
uprightness
Correct answer is C
Allah made Muhammad grow in a good manner, and Allah took care of him, so he was the the best of his people in physical wellbeing and in attitude, he was the most generous, the most patient, the most truthful, the most sincere and the most honest, so his people called him al-Ameen (the trustworthy).