Was prophet Mohammad (peace be upon him) chosen as the last messenger only just Allah wanted to or he was worthy of this position by his deeds?

Please don’t be offended by this question. I'm just wondering about it and if you could answer this - it would be better. My question is "was the prophet Mohammad (peace be upon him) literally chosen by Allah (in fact that was) or only He (peace be upon him) attain this highest honour by his actions and characteristics, as Allah "azzawajal said many times in the Holy Quran about the prophet that (paraphrase) 'in this way He "azzawajal made him(the prophet) able to convey His message to the nation he sent to? I mean what was exactly the reasons behind choosing particularly this man (Prophet Mohammad peace be upon him) apart from the whole uncountable creation of Allah "azzawajal? Thanks in advance.