Choose the correct option to complete the series.
Expansion : Contraction :: Triumph : ?

The correct option is Defeat.

Step-by-step Explanation:

1. Analyze the relationship in the first pair:
The given pair is Expansion : Contraction.
"Expansion" means the act of becoming larger or expanding, while "Contraction" means the process of becoming smaller or shrinking.
Therefore, "Expansion" and "Contraction" are exact antonyms (opposite in meaning).

2. Apply the same logic to the second pair:
We need to find the word that stands in the same antonymous relationship to Triumph.
"Triumph" means a great victory, achievement, or success.

3. Evaluate the given options:
- Advancement: Means progress or development (not an antonym of triumph).
- Profit: Means financial gain (unrelated in this context).
- Victory: Means success or winning, which is a synonym of triumph.
- Defeat: Means failure to win or being beaten, which is the exact opposite (antonym) of triumph.

Thus, just as Expansion is the opposite of Contraction, Triumph is the opposite of Defeat.