What kind of sentence error is demonstrated below?

i saw a door that looked as though no one ever used it, naturally, i opened it then.

fragment
comma-splice
no error found

Read the passage from chapter 17 of the prince. and of all princes, it is impossible for the new prince to avoid the imputation of cruelty, owing to new states being full of dangers. hence virgil, through the mouth of dido, excuses the inhumanity of her reign owing to its being new, saying: "res dura, et regni novitas me talia cogunt moliri, et late fines custode tueri."(*) nevertheless he ought to be slow to believe and to act, nor should he himself show fear, but proceed in a temperate manner with prudence and humanity, so that too much confidence may not make him incautious and too much distrust render him intolerable. . against my will, my fate a throne unsettled, and an infant state, bid me defend my realms with all my pow'rs, and guard with these severities my shores. which statement best evaluates machiavelli’s argument? machiavelli ineffectively argues that new princes should do everything in their power to guard their kingdoms. machiavelli effectively argues that new princes must be cruel and cautious in order to protect their new kingdoms. machiavelli effectively argues that new princes should not be cruel and should proceed carefully in their new kingdoms. machiavelli ineffectively argues that new princes should not show fear, but should be self-confident and intolerable.