Option 1 -> Inborn means inherent or natural from birth, which is opposite to extraneous.
Option 2 -> Alien means foreign or coming from outside, which matches the meaning of extraneous (external, not belonging).
Option 3 -> Innate means naturally present from birth, which is the opposite of extraneous.
Option 4 -> Excessive means more than necessary, which relates to quantity not origin or relevance.
Hence, Option 2: Alien -> Extraneous means "irrelevant, unrelated, or coming from outside," and alien shares this meaning of being foreign or external to something -> correct