Explanation:

- Plight: This word refers to a difficult or unfortunate situation. It's often used to describe someone's struggle or problem.

- Option 1: Predicament: Like "plight," this word describes a difficult or unpleasant situation. It is similar in meaning, not the opposite.

- Option 2: Dilemma: This means a situation where a difficult choice has to be made between two or more alternatives. It shares a similar meaning with "plight."

- Option 3: Quandary: This refers to a state of uncertainty or perplexity, especially about what to do. Again, it is similar to the word "plight."

- Option 4: Advantage: This word refers to a beneficial or favorable situation. It is an appropriate opposite of "plight."