Which of these languages is the least logical?

[anvi]

Of the choices, I'd say English too.  I guess I'd say that because English is far less inflected than these other European languages, and much of its word-stock has accreted from so many different languages.  But that conclusion is based on the languages being considered here and is not a general rule by any means.  Classical and modern Chinese, for example, have almost no inflection whatsoever, but, contrary to popular belief, the structure of both strikes me as extremely logical, while classical Sanskrit, despite being inflected almost to infinity, can at times be quite arbitrary.  I'm no linguist, but my study of different languages makes it seem this way to me.