Why are support sentences important in a paragraph?

A) They create a transition to the topic sentence
B) They explain or justify the topic sentence
C) They eliminate unity in the paragraph
D) They explain denotative terms
E) They extend the length of simple sentences

Which of these is assumed to be constant along an aggregate supply curve?

A) The price level in an economy
B) The exchange rate between the domestic and a foreign currency
C) The state of technology used in production
D) The unemployment rate
E) The real GDP