In the described boarding order, the first person aboard is the most junior in rank. Which word best identifies this person?

• A. Senior
• B. Junior
• C. Lieutenant
• D. Captain

Answer: (B)

Understanding relative seniority helps explain this. If someone is described as the most junior, they hold the lowest level of rank or experience among the group. The word that fits this best is junior, because it explicitly marks lower status compared to others. The other terms point to higher or specific ranks rather than describing someone as the lowest in rank: senior suggests higher status, while lieutenant and captain are particular ranks that imply authority rather than simply being the least senior. So the best word to identify the person who is the most junior is junior.