Answer:
The reasons that cities boomed during the Middle Ages are more employment opportunities, increased trade, and growing interest in culture and art.
Found at the lowest point of a large drainage area, these seasonal, marsh-like ponds collect and store water from rain and runoff. Unlike vernal pools, playas generally fill when temperatures are unsuitable for plant growth, and often the water is salty, alkali or both.
source- google
B & C in my opinion. If it asks for one— B. is what I would choose.
A convergent plate boundary is when two plates move towards each other, also known as a destructive plate boundary. So, the answer is A.
