In each question, there are five sentences or parts of sentences that form a paragraph. Identify the sentence(s) or part(s) of sentence(s) that is/are correct in terms of grammar and usage. Then, choose the most appropriate option.
A. So once an economy is actually in a recession,
B. the authorities can, in principle, move the economy
C. out of slump - assuming hypothetically
D. that they know how to - by a temporary stimuli.
E. In the longer term, however, such polices have no affect on the overall behaviour of the economy.