Answer :

To determine the proportion of marriages in the U.S. that end in divorce, we must evaluate the options provided and select the one that accurately reflects the data:

a) about 25%
b) about one-third
c) about 20%
d) between 40% and 50%

Given the historical statistics and research data on the rate of divorce in the United States, the proportion of marriages ending in divorce has been examined:

- Option a), "about 25%", suggests that only a quarter of all marriages end in divorce.
- Option b), "about one-third", implies that approximately 33% of marriages result in divorce.
- Option c), "about 20%", suggests an even lower percentage, indicating that only one-fifth of marriages end in divorce.
- Option d), "between 40% and 50%", means that nearly half of all marriages end in divorce.

Analyzing the historical divorce rates and acknowledging that they tend to fluctuate around this range, it seems that the most accurate representation of the proportion of marriages that end in divorce lies within the higher range.

Therefore, the correct answer is option d), which states that the proportion of marriages in the U.S. that end in divorce is between 40% and 50%.