The primary purpose of the second paragraph is which of the following
A．To show that Augustan Rome and fifth-century Athens are examples of cultural, economic, and military expansion against which all subsequent cases must be measured.
B．To suggest that cultural, economic, and military advances have tended to be closely interrelated in different societies.
C．To argue that, while the revivals of Augustan Rome and fifth-century Athens were similar, they are unrelated to other historical examples.
D．To indicate that, wherever possible, historians should seek to make comparisons with the earliest chronological examples of revival.