I think it's D. Hindu- Arabic Numerals
Answer:
Two days after sealing off free passage between East and West Berlin with barbed wire, East German authorities begin building a wall—the Berlin Wall—to permanently close off access to the West.
A. True yes San Diego is a megalopolis
The correct answers are a. learning and the arts flourished, supported by the thriving gupta economy and c. gupta artisans produced goods sold locally and as far away as the middle east and southeast asia
These are evidence that explain their prosperity.