Multiple choice Directions: Pick the odd one out. Offspring, reflection, aircraft, grapefruit, salmon Offspring Reflection Aircraft Grapefruit Salmon Reveal answer Fill a bubble to check yourself B Correct answer Explanation Correct. The four words - offspring, aircraft, grapefruit, and salmon – remain the same in the plural form as well. The word ‘reflection’ is the odd one here since it forms the plural by adding –s to the singular noun (reflections).