The correct answer is: C. Erratic : Predictability
Ephemeral means lasting for a very short time, while permanence means lasting or existing for a long time. Erratic means not regular or consistent, while predictability means the quality of being able to be predicted.
Commendable means deserving praise, while reputation means the general opinion that people have of someone or something. Immaculate means free from dirt or marks, while cleanliness means the state of being free from dirt or marks. Spurious means not genuine or true, while emulation means the act of copying or imitating someone or something.
In the original pair, ephemeral and permanence are opposites. In the correct answer, erratic and predictability are also opposites. The other options are not opposites.