Correct Answer: (a)
Solution:Business activity at high level with increasing income, output and employment at macro level, shows that the economy is in boom period. While during recession, gradual fall of income, output and employment with business activity in a low gear is noticed. Unprecedented level of under-employment and unemployment, drastic fall in income, output and employment shows that economy is in depression. When economy recovers, then there is steady rise in the general level of prices, income, output and employment. shows that economy is in depression. When economy recovers, then there is steady rise in the general level or prices, income, output and employment.