Answer:
D) one cannot determine whether baseball stars today enjoy a higher standard of living than Babe Ruth did in 1931 without additional information regarding increases in prices since 1931.
Explanation:
The value of money changes over time due to inflation and to be able to compare someone's salary back in 1931 with a current salary we would need information regarding how inflation affected the purchasing power of the US dollar. For example, back then a new car costed less than $1,000. Since Babe Ruth was extremely famous and successful, his salary was probably huge compared to the average salaries of back then.