Celsius, people in Europe would use Celsius
Answer:
The answer is option C.
Explanation: Homeland Security Agency was created as a domestic agency aimed at maintaining order during the crisis such as the chaos that followed the 9/11 attacks. President Bush established this department to protect the interior of America and the citizens from any kind of terror attack and also to prevent this terror attacks. But now it is working as an organization also in immigration and other interior security issues.
