D
In the Hartshorn Building, most but not all of the third-floor offices are larger than any office on the second floor. The fourth-floor offices are all larger than any office on the second floor. However, all the second-floor offices are larger than any office on the first floor. If the statements above are true, which one of the following must also be true?
A: Some first-floor offices are as large as the smallest fourth-floor offices.
B: Some fourth-floor offices are not as large as the largest third-floor offices.
C: Some first-floor offices are as large as the smallest third-floor offices.
D: Some third-floor offices are not as large as the smallest fourth-floor offices.