The earliest formal number systems, complete with place values such as the units place and the tens place, which date back only about 3,500 years, to ancient Mesopotamia, whereas quantitative record keeping is much older.

A) which date back only about 3,500 years, to ancient Mesopotamia, whereas

B) which dates back only about 3,500 years, to ancient Mesopotamia, but

C) dates back only about 3,500 years, to ancient Mesopotamia, but

D) dates back only about 3,500 years, to ancient Mesopotamia, and

E) date back only about 3,500 years, to ancient Mesopotamia, whereas

OA E

Source: Veritas Prep