Consider the following 1. The Geographical Pivot of History2. The Normal Cycle of Erosion3. Revenstein's laws of Migration4. Ratzel's AnthropogeographieTheir correct chronological sequence is

• A. 2, 3,1,4
• B. 3,1,2,4
• C. 4,2,3,1
• D. 3,4,2,1