The first scientist to challenge the concept of race was Franz Boas.
I believe it is D.
Because barter system. Like it kinda explains its self.
They were engaged in activism
Answer:
The first six months of the war became known as the 'Phoney War' because there was almost no fighting and no bombs were dropped. This gave the government more time to protect Britain from an attack. Protections included: Barrage balloons were deployed to force the Luftwaffe to fly higher, if and when they attacked.
Explanation: