thus = in this/that/ way, with this/that/ /fact/situation/result

hence = as an inference, as a deduction, it is implied that, it follow that

therefore = as a result, consequently, for this/that reason
ある結果とそれが生まれた理由の関係を表す場合には、thusやhenceより適切
as a resultの意味は、henceもthusもあるが、特にthusは弱い