In paragraph 3, why does the author provide the information that the number of signs in use had dropped from 2,000 to 600 by 2300 B.C.E.? A. To argue that the development of writing involved periods of growth followed by periods of decline B. To demonstrate that earlier written texts used a larger vocabulary than later texts, which were aimed at a broader audience C. To support the claim that the range of words expressed by logograms varied widely depending on time period and type of text D. To provide evidence for the increased efficiency of using signs to express syllables rather than whole words