Friedrich Nietzsche is the correct author of 'Thus Spoke Zarathustra' (Also Sprach Zarathustra), though the spelling in the options is incorrect ('Wihelm' should be 'Wilhelm' and 'Nietzshe' should be 'Nietzsche'). The spelling error doesn't change the fact that option A represents the correct answer. William Shakespeare, Robert Johnson, and Robert Louis are not associated with this philosophical work.