💡 Detailed Explanation
The correct answer is 「あるいは」 (aruiha), meaning 'or' / 'possibly'. When used as 'A, aruiha B', it suggests B as another possibility of similar weight. 「または」 also means 'or' but lacks the tentative 'or perhaps' nuance. 「それとも」 is used for questions (Is it A? Or B?). 「したがって」 means 'therefore'.