Correct Option: B

immune (Adjective) : not affected by something ; protected from something ; that cannot catch or be affected by a particular disease/illness
susceptible (Adjective) : very likely to be influenced, harmed/ affected ; capable of something; impressionable
incredible (Adjective) : unbelievable
predictable (Adjective) : possible to foretell
unpredictable (Adjective) : impossible to foretell