Of these three, I guess Hindi is the easiest to learn. Simple alphabet, two tenses, no special characters to know. I guess Korean is a close second. But all of them I'd consider easier to learn than English.
I think English has two advantages : 1- it is already very widely used 2- more importantly, it is a fairly simple language compared to French , German , Arabic , Mandarin etc. Can't really think of a language simpler than English
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