The answer is b. a common currency
hope this helps ! :D
India and Pakistan used to be one country up until 1947 - when the Partition of India happened.
Ever since then their relationship has been very problematic - Kashmir is disputed between the two nations, and their relationship can be described as competition (for example they both have nuclear arms and had a kind of unofficial competition over who has more ).
Answer: The Earth's crust that formed these mountains was once covered with an ocean
