Explanation:

- The sentence presents a situation where there is a difference in pay between men and women, specifically highlighting that women earn less than men in many countries, with Germany as an example.

- Option 1: "Unlikeliness" denotes something improbable or unlikely to happen, which doesn't fit the context describing a common situation.

- Option 2: "Equivalence" implies equality or being the same, which contradicts the context of unequal pay.

- Option 3: "Disagreement" generally means having a differing opinion, which is unrelated to the context of comparing pay levels.

- Option 4: "Disparity" indicates a great difference or inequality, which accurately describes the gender pay gap discussed in the sentence.